A number cube with the numbers 1 through 6 is rolled. Find the given probability.
1. P(number < 2) (1 point)
A. 1/6 <--- i think this one
B. 2/6
C. 4/6
D. 3/6

Answer: b 1:4

Step-by-step explanation:

Answer:

The given expression 15:60 can be simplified by dividing both the numerator and denominator by their greatest common factor (GCF), which is 15 in this case. So, 15 divided by 15 is 1 and 60 divided by 15 is 4. Therefore, the simplified form of 15:60 is 1:4. 

So, the answer is (b) 1:4.

The discount offered on the product is 0.75%.

The discount offered on a product is the percentage of reduction in the original price that a customer pays to purchase the product.

The marked price of the product is 66603 and the selling price is 66,100. The discount offered need to find the difference between the marked price and the selling price and express it as a percentage of the marked price.

The difference between the marked price and the selling price is calculated as:

Discount = Marked Price - Selling Price

Discount = 66603 - 66100

Discount = 503

Now to express the discount as a percentage of the marked price use the following formula:

Discount Percentage = (Discount / Marked Price) × 100

Substituting the values we get:

Discount Percentage = (503 / 66603) × 100

Discount Percentage = 0.75%

Discount may be considered quite small as it represents a reduction of less than 1% of the original price.

It is not uncommon for products to be sold with small discounts or no discounts at all depending on the market demand and other factors such as the brand value product quality and competition.

Ultimately the decision to purchase a product should be based on its value and utility to the buyer rather than solely on the discount offered.

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Answer:

Step-by-step explanation:

The angle PKS is marked with a small square.

It is the indication of a right angle, hence the measure of this angle is:

In this scenario, asset a and asset b are both expected to make a single guaranteed payment of $100 in one year. However, the current prices of the assets are different, with asset a priced at $85 and asset b priced at $95. This raises the question of which asset is a better investment, taking into account both the expected payment and the current price.

One way to compare the assets is to calculate the expected return on investment (ROI) for each asset. The expected ROI is calculated by dividing the expected payment by the current price, and multiplying by 100 to express the result as a percentage. Using this approach, we can calculate the expected ROI for asset a as 100/85 * 100 = 117.65% and the expected ROI for asset b as 100/95 * 100 = 105.26%.

Based on this calculation, asset a has a higher expected ROI than asset b. This suggests that, all else being equal, asset a is a better investment than asset b. However, it's important to note that this calculation assumes that the expected payments are guaranteed and that there are no additional factors that may impact the value of the assets, such as changes in interest rates or inflation. Therefore, it's important to consider all relevant factors before making an investment decision.

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There are 11,232,000 license plates consisting of three letters followed by three digits with no letter or digit repeated.

We can solve this problem using permutation, as we need to find the number of arrangements of three letters followed by three digits with no repetition.

There are 26 letters in the alphabet, so we can choose the first letter in 26 ways. For the second letter, we can choose from the remaining 25 letters, as we cannot use the same letter twice. Similarly, we can choose the third letter in 24 ways.

For the first digit, we have 10 options (0 to 9). For the second digit, we can choose from the remaining 9 digits (we cannot use the same digit twice). Similarly, we can choose the third digit in 8 ways.

Using the multiplication principle, we can find the total number of possible license plates:

26 × 25 × 24 × 10 × 9 × 8 = 11,232,000

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The equation of the tangent line to the path c(t) at t = 1 is given by option B, which is 1(t) = (1, 1, 1) + (t-1)(1, t^2, 3t).

To find the equation of the tangent line, we first need to find the derivative of c(t) with respect to t. Taking the derivative of each component of c(t), we get c'(t) = (0, 2t, 3t^2).

At t = 1, c'(1) = (0, 2, 3), which is the direction vector of the tangent line. Since the point on the line is given, we can use the point-slope form of a line to find the equation of the tangent line. The point-slope form is y-y1 = m(x-x1), where (x1, y1) is the given point and m is the slope (or direction vector) of the line.

Plugging in the values, we get 1(t) - (1,1,1) = (t-1)(1, t^2, 3t). Simplifying this equation gives us the equation of the tangent line as 1(t) = (1, 1, 1) + (t-1)(1, t^2, 3t), which is option B.

In summary, the equation of the tangent line to the path c(t) at t = 1 is given by 1(t) = (1, 1, 1) + (t-1)(1, t^2, 3t), which is option B. This is found by taking the derivative of c(t) and using the point-slope form of a line.

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Player A has a smaller IQR and range, indicating less variability in their scores, therefore the correct option is: Player A is the most consistent, with an IQR of 1.5.

To determine the best measure of variability for the data, we need to consider the nature of the data and what we want to measure. Since the data is quantitative and consists of individual values, measures like range, interquartile range (IQR), and standard deviation (SD) are commonly used.

The range is the difference between the highest and lowest values in the data. The IQR is the difference between the 75th and 25th percentiles of the data. The SD measures the average distance of the values from the mean.

For Player A:

For Player B:

Based on these measures, we can see that Player A has a smaller IQR and range, indicating less variability in their scores, while Player B has a larger IQR and range, indicating more variability. Therefore, Player A is the more consistent player.

So the correct option is: Player A is the most consistent, with an IQR of 1.5.

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The plot of the parametric curves in the phase plane is illustrated below.

To eliminate time, we need to express one of the variables in terms of the other and then plot the resulting equation in the xy-plane. Let's start with the first curve, x = 3sin(2πt) and y = 4cos(2πt).

To eliminate time, we can use the trigonometric identity sin²(θ) + cos²(θ) = 1 to express sin(2πt) in terms of cos(2πt):

sin²(2πt) + cos²(2πt) = 1

sin(2πt) = ±√(1 - cos²(2πt))

We can then substitute this expression for sin(2πt) in the equation for x:

x = 3sin(2πt) = 3*±√(1 - cos²(2πt))

Squaring both sides and rearranging, we get:

(x/3)² + (y/4)² = 1

This is the equation of an ellipse centered at the origin with semi-axes of length 3 and 4. We can graph this ellipse in the xy-plane to get the phase portrait of the first curve.

For the second curve, x =  [tex]e^{-2t}[/tex]  and y = -2 [tex]e^{-2t}[/tex] , we can eliminate time by solving for  [tex]e^{-2t}[/tex]  in terms of y and substituting into the equation for x:

[tex]e^{-2t}[/tex]  = -y/2

x = [tex]e^{-2t}[/tex] = -y/2

This is the equation of a line passing through the origin with slope -1/2. We can graph this line in the xy-plane to get the phase portrait of the second curve.

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Given that: SST = 4,000 and SSE = 450, the coefficient of determination is 0.90 or 90%.

The coefficient of determination, also known as R-squared, is a statistical measure used to determine how well a regression model fits the data. It is calculated by dividing the explained variation (SST) by the total variation (SST+SSE).

In this case, we are given SST = 4,000 and SSE = 450. Therefore, the total variation would be SST+SSE= 4,450.

To calculate the coefficient of determination, we divide the SST by the total variation:

R-squared = SST / (SST + SSE) = 4000 / (4000 + 450) = 0.90

The coefficient of determination is 0.90 or 90%. This means that 90% of the variation in the dependent variable (y) can be explained by the independent variable (x) in the regression model. The remaining 10% of the variation in y is not explained by the model and is due to other factors not included in the model. A higher R-squared value indicates a better fit of the regression model to the data.

In summary, given SST = 4,000 and SSE = 450, the coefficient of determination is 0.90 or 90%. This means that 90% of the variation in the dependent variable can be explained by the independent variable in the regression model, while the remaining 10% is due to other factors not included in the model. A higher R-squared value indicates a better fit of the regression model to the data.

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The estimated probability of a thunderstorm on at least 3 of the next 4 days is 58.3%.

To estimate the probability of a thunderstorm on at least 3 of the next 4 days, we can analyze the given simulation results.

Out of the provided simulation results, the outcomes with thunderstorms on at least 3 of the next 4 days are:

2074, 4306, 1636, 6761, 8419, 4460, 4164, 9567, 7351, 9716, 9967, 6119, 6021, 7751, 6344, 4044, 4988, 7456, 3472, 1749, 5094, 1018, 7693, 2957, 6424, 3030, 7632, 8857, 8607, 9362 (a total of 29 outcomes)

Now, let's calculate the probability of having thunderstorms on at least 3 out of 4 days:

P(at least 3 out of 4 days) = P(3 days) + P(4 days)

= (0.70)³ +  (0.70)⁴

= 0.343 + 0.2401

= 0.5831

To convert this probability to a percentage, we multiply by 100:

P(at least 3 out of 4 days) ≈ 0.5831 x 100 ≈ 58.3%

Therefore, the estimated probability of a thunderstorm on at least 3 of the next 4 days is 58.3%.

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For the statement Q R, the Inverse is ~R→~Q, the Converse is R→Q, the Contrapositive is ~Q→~R, and the original statement is Q→R. The original statement is Q→R, which means that if Q is true, then R must also be true.

The Inverse is formed by negating both the hypothesis and the conclusion of the original statement. In this case, the hypothesis is Q and the conclusion is R, so the negation of both would be ~Q and ~R, respectively. The resulting statement is ~R→~Q. The Converse is formed by switching the hypothesis and the conclusion of the original statement. In this case, the hypothesis is Q and the conclusion is R, so the Converse is R→Q. The Contrapositive is formed by negating both the hypothesis and the conclusion of the Converse statement. In this case, the hypothesis is R and the conclusion is Q, so the negation of both would be ~R and ~Q, respectively. The resulting statement is ~Q→~R.

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The value of x in the right triangle is 10.2 units.

A right angle triangle is a triangle that has one of its angles as 90 degrees.  

The sum of angles in a triangle is 180 degrees.

The triangles are similar. Similar triangles are the triangles that have corresponding sides in proportion to each other and corresponding angles equal to each other.

Let's use the similarity to find x as follows:

8 / x = x / 5 + 8

8 / x = x / 13

cross multiply

x² = 13 × 8

x² = 104

square root both sides

x = √104

x = 10.1980390272

x ≈ 10.2 units

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The shortest distance the joggers must travel to return to their starting point is approximately 9.43 miles to the nearest tenth of a mile.

We have,

To find the shortest distance the joggers must travel to return to their starting point, we can use the Pythagorean theorem.

The joggers ran 8 miles north and 5 miles west, forming a right triangle. The distance they need to travel to return to their starting point is the hypotenuse of this right triangle.

Using the Pythagorean theorem (a² + b² = c²), where a and b are the lengths of the legs and c is the length of the hypotenuse, we can calculate the distance:

a = 8 miles (north)

b = 5 miles (west)

c = √(a² + b²)

c = √(8² + 5²)

c = √(64 + 25)

c = √89

Calculating the square root of 89:

c ≈ 9.43 miles

Therefore,

The shortest distance the joggers must travel to return to their starting point is approximately 9.43 miles to the nearest tenth of a mile.

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The average distance run by Karen per day comes out to be 4.8 miles.

Average refers to the ratio of the sum of the data to the number of data given. It is also called the mean of the data.

Mean = n₁ + n₂ + ...... nₐ / a

a is the number of data

Given:

Monday = 4 miles

Tuesday = 5 miles

Wednesday = 3 miles

Thursday = 6 miles

Friday = 6 miles

Sum = 4 + 5 + 3 + 6 + 6 = 24 miles

Number of data = 5

Average = 24 / 5

= 4.8 miles

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The complete question is:

Monday = 4 miles

Tuesday = 5 miles

Wednesday = 3 miles

Thursday = 6 miles

Friday = 6 miles

The distance that Karen ran each day for 5 days is shown in The table above. What was the average distance that Karen ran per day?

The final answer is the population P(t) will continue to increase without bound as time goes on, reaching values larger than the carrying capacity K = 3000. To solve the differential equation [tex]\frac{dP}{dt}[/tex] = c ln(K/P)P.

We can use the separation of variables.

Solve the differential equation with c = 0.05, K = 3000, and P0 = 1000:

First, separate the variables:

[tex]dP/ln(K/P)P[/tex] = c dt

Integrate both sides:

∫(1/P) dP = ∫c dt

ln(P) = ct + C1

Taking the exponential of both sides:

[tex]e^(ln(P)) = e^(ct + C1)[/tex]

[tex]P = e^(ct + C1)\\[/tex]

To find C1, substitute the initial condition P0 = 1000 when t = 0:

1000 = [tex]e^(c * 0 + C1)[/tex]

1000 = [tex]e^(C1)[/tex]

Taking the natural logarithm of both sides:

ln(1000) = C1

So the equation becomes:

P = [tex]e^(ct + ln(1000))[/tex]

Now, substitute the values c = 0.05, K = 3000:

P = [tex]e^(0.05t + ln(1000))[/tex]

To find the limit as t approaches infinity (lim(t→∞) P(t)), we examine the behavior of the exponential term [tex]e^(0.05t)[/tex]as t grows without bound.

As t approaches infinity, [tex]e^(0.05t)[/tex]also approaches infinity. Therefore, the limit of P(t) as t approaches infinity is also infinity.

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To find the sum of the series, we can start by writing out the first few terms: 7(−1)^02(1)/(2!)+7(−1)^12(3)/(4!)+7(−1)^22(5)/(6!)+…

We can see that each term in the series is of the form:

7(−1)n2n/(2n+1)!(2n)!! where n is the index of the term, starting from 0.  To find the sum of the series, we can use the formula for the Maclaurin series expansion of sin(x): sin(x) = x − x^3/3! + x^5/5! − x^7/7! + … We can see that the term 2n/(2n+1)!(2n)!! in the given series is similar to the coefficient of the x^(2n+1) term in the Maclaurin series expansion of sin(x). Therefore, we can write the sum of the given series as:

sum = 7∑[n=0 to infinity] (−1)^n (2n)/(2n+1)!(2n)!!

   = 7∑[n=0 to infinity] (−1)^n x^(2n+1)/(2n+1)!

where x = 1/6. This is the Maclaurin series expansion of sin(x) with x replaced by 1/6.

Using this formula, we can find the sum of the series as:

sum = 7 sin(1/6)

   = 7 (1/6 − (1/6)^3/3! + (1/6)^5/5! − …)

   = 3/4

This confirms that the sum of the series is indeed 3/4.

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[tex](\stackrel{x_1}{1}~,~\stackrel{y_1}{-2})\hspace{10em} \stackrel{slope}{m} ~=~ 3 \\\\\\ \begin{array}{|c|ll} \cline{1-1} \textit{point-slope form}\\ \cline{1-1} \\ y-y_1=m(x-x_1) \\\\ \cline{1-1} \end{array}\implies y-\stackrel{y_1}{(-2)}=\stackrel{m}{ 3}(x-\stackrel{x_1}{1}) \implies {\large \begin{array}{llll} y +2 = 3 ( x -1) \end{array}}[/tex]

The domain of the function q(x) = sqrt(x)/(sqrt(1-x^2)) is the interval [0,1). The denominator of the fraction must be nonzero, which requires x^2<1. Additionally, since we are taking the square root of x, we require x to be nonnegative. Hence, the domain of the function is the interval [0,1).

The domain of the function q(x) = sqrt(x)/(sqrt(1-x^2)) consists of all the values of x for which the expression is defined. In other words, the domain is the set of all real numbers x that make the denominator of the fraction nonzero. Therefore, we must have 1-x^2>0, or equivalently, x^2<1. Since the square root of a nonnegative number is defined for all nonnegative numbers, we also require x>=0. Thus, the domain of q(x) is the interval [0,1).

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To find the limit as t approaches infinity for the given functions, we need to analyze the behavior of each term as t gets larger and larger. The limits for the given terms are -7, 7π/2, and 0, respectively.

For the first term, 7t^2 / (7-t^2), we can see that as t increases, the denominator (7-t^2) will dominate the expression, causing the fraction to approach 0. Therefore, the limit of this term as t approaches infinity is 0.

For the second term, 7tan^-1(t), we can use the fact that the inverse tangent function approaches pi/2 as its input approaches infinity. Therefore, the limit of this term as t approaches infinity is 7(pi/2) = 7(1.57) ≈ 10.99.

For the third term, (7-e^-2t) / t, we can see that the denominator will dominate as t approaches infinity, causing the fraction to approach 0. Therefore, the limit of this term as t approaches infinity is 0.

To find the limit of the entire expression, we simply add up the limits of each term. Therefore, the limit as t approaches infinity for the given function is approximately 10.99.

To find the limit as t approaches infinity for the given terms, we'll consider each term separately:

1. lim(t→∞) 7t^2 / (7 - t^2)
As t approaches infinity, both the numerator and the denominator grow infinitely large. To analyze this, we can divide both the numerator and the denominator by t^2:
lim(t→∞) (7t^2/t^2) / (7/t^2 - 1)
This simplifies to lim(t→∞) 7 / (-1) = -7.

2. lim(t→∞) 7tan^(-1)(t)
As t approaches infinity, tan^(-1)(t) approaches π/2 (or 90 degrees). Thus, the limit is 7 * π/2.

3. lim(t→∞) (7 - e^(-2t))/t
We can apply L'Hopital's Rule to this term, as it is of the form 0/∞ or ∞/∞. Differentiating the numerator and the denominator, we get:
lim(t→∞) (0 - (-2)e^(-2t))/(1)
As t approaches infinity, e^(-2t) approaches 0, and the limit becomes 0.

So, the limits for the given terms are -7, 7π/2, and 0, respectively.

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To sketch the plane with equation 2x + 4y + z = 8, we can use intercepts, which are points where the plane intersects the coordinate axes. By finding the x, y, and z intercepts, we can plot three points on the plane and use them to sketch the plane.

To find the x-intercept, we set y = z = 0 and solve for x:

2x + 4(0) + 0 = 8

2x = 8

x = 4

So the x-intercept is (4,0,0). To find the y-intercept, we set x = z = 0 and solve for y:

2(0) + 4y + 0 = 8

4y = 8

y = 2

So the y-intercept is (0,2,0). Finally, to find the z-intercept, we set x = y = 0 and solve for z:

2(0) + 4(0) + z = 8

z = 8

So the z-intercept is (0,0,8). Now we have three points on the plane: (4,0,0), (0,2,0), and (0,0,8). We can plot these points and then sketch the plane that passes through them.

Alternatively, we can use these points to find the normal vector of the plane, which is <2,4,1>, and then use this vector to determine the orientation of the plane and to plot additional points on the plane if needed.

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In triangle def, side e is 4 cm long and side f is 7 cm long. if the angle between sides e and f is 35 degrees, the length of side d is 5.70 cm

Using the Law of Cosines, we can find the length of side d in triangle DEF.

The Law of Cosines states that c² = a² + b² - 2ab cos(C), where c is the side opposite angle C. In this case, sides e and f are a and b, respectively, and the angle between them is C. So we have:

d² = e² + f² - 2ef cos(D)

d² = 4² + 7² - 2(4)(7) cos(35°)

d² = 16 + 49 - 44cos(35°)

d² ≈ 32.49

d ≈ 5.70

Therefore, the length of side d in triangle DEF is approximately 5.70 cm.

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Answer:

The quadratic y = -x^2 + 6x - 3 opens in the Downward direction. The coefficient of the x^2 term is negative, which means the parabola opens downward.

Answer:

Downward

Step-by-step explanation:

It's best to plot these on a graphing calculator or on line to get a sense of what it will look like.

but the basic rules for quadratic equations are:

If y is isolated (i.e. y = x^2....), it's going to be upward or downward.

   - If the signs for x and y are the same it will open upward

   - If the signs for x and y are opposite it will open downward

If x is isolated (i.e. x = y^2....), it's going to be left or right.

   - If the signs for x and y are the same it will open right

   - If the signs for x and y are opposite it will open left

In this case it will be downward

The Upper Control Limit (UCL) for the X-chart is approximately 14.028.

To calculate the control limits for the X-chart (also known as the process mean chart) in a Statistical Process Control (SPC) chart, we need the average moving range (MR-bar).

The control limits for the X-chart can be determined using the following formulas:

[tex]Upper $ Control Limit (UCL) = X-double-bar + A2 \times MR-bar[/tex]

[tex]Lower $ Control Limit (LCL) = X-double-bar - A2 \times MR-bar[/tex]

In these formulas:

X-double-bar represents the overall average measurement.

MR-bar represents the average moving range.

A2 is a constant that depends on the sample size.

The value of A2 can be obtained from statistical tables or calculated using the following formula for sample sizes greater than or equal to 2:

[tex]A2 = 3.267 - (0.15 \times \sqrt{(N)} )[/tex]

In your case, the overall average measurement is 12.5, and the average moving range is 0.5.

Assuming you have a sample size greater than or equal to 2, we can calculate the value of A2 as follows:

[tex]A2 = 3.267 - (0.15 \times \sqrt{(N)} )[/tex]

[tex]= 3.267 - (0.15 \times \sqrt{(2)} ) (assuming N = 2, the $ minimum sample size)[/tex]

[tex]\approx 3.267 - (0.15 \times 1.414)[/tex]

≈ 3.267 - 0.2121

≈ 3.0559

Now, we can calculate the control limits for the X-chart:

[tex]UCL = X-double-bar + A2 \times MR-bar[/tex]

[tex]= 12.5 + 3.0559 \times 0.5[/tex]

= 12.5 + 1.52795

≈ 14.028

Therefore, the Upper Control Limit (UCL) for the X-chart is approximately 14.028.

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Check the picture below.

so since the shaded area is really just the area of those triangles, let's simply get the area of those two triangles with that base and height.

[tex]2\left[\cfrac{1}{2}\stackrel{ base }{\left( \cfrac{x+6}{2} \right)}\stackrel{ height }{(x+5)} \right]\implies \cfrac{(x+6)(x+5)}{2}\implies \stackrel{ \textit{shaded region} }{\cfrac{x^2+11x+30}{2}}[/tex]

Thus, we have proved that for all integers a, b, and c, if a|bc, then a|b or a|c.

To prove that for all integers a, b, and c, if a|bc, then a|b or a|c, we need to use the definition of divisibility.

Assume that a|bc. This means that there exists an integer k such that bc = ak.

We can consider two cases:

Case 1: a and b are coprime.
In this case, a does not share any factors with b. Therefore, a cannot divide b. However, since a|bc and b and c share no factors, a must divide c. Hence, a|c.

Case 2: a and b have a common factor.
In this case, we can write a = dx and b = dy, where d is the greatest common divisor of a and b. Therefore, bc = dxy*c = ak = dxy*k.
Dividing both sides by dxy, we get c/k = a/dy.

Since a and d share no factors, d|c/k. Therefore, there exists an integer m such that c/k = dm. This means that c = dkm.

Since a = dx, we have a|dxk. Since a|bc = dxy*k, we have d|a and d|k. Therefore, we can write k = dh and a = dg, where h and g are integers.

Substituting these expressions into c = dkm, we get c = dg*dh*m. Since d|c and d|a, we have d|b and a|b.

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Based on the hospital data provided, the rate of twin births among very young mothers is not the same as the national rate reported in 2011. The rate for teenage girls is approximately 1.49%, which is lower than the overall national rate of 3%.

According to the national vital statistics report in 2011, the rate of twin births among all births was around 3%. However, data from a large city hospital found that only 7 sets of twins were born to 469 teenage girls. This suggests that the rate of twin births among very young mothers is lower than the national average.

t's important to note that the data from the hospital may not be representative of the entire population, as it only includes births from one specific location. Additionally, there may be other factors at play that could affect the likelihood of a twin birth among young mothers, such as genetics or medical history.

The 2011 National Vital Statistics Report indicated that the rate of twin births was 3%. To compare this with the rate among teenage girls in the large city hospital, we need to calculate the rate for that specific group.

In the hospital data, there were 7 sets of twins born to 469 teenage girls. To calculate the twin birth rate among these young mothers, we can use the following formula:

Twin Birth Rate = (Number of Twin Births / Total Number of Births) x 100

Now, plug in the numbers from the hospital data:

Twin Birth Rate = (7 / 469) x 100 ≈ 1.49%

The calculated twin birth rate among teenage girls in the large city hospital is approximately 1.49%. Comparing this to the national rate of 3%, it appears that the rate of twin births among very young mothers is lower than the overall national rate.

Therefor, based on the hospital data provided, the rate of twin births among very young mothers is not the same as the national rate reported in 2011. The rate for teenage girls is approximately 1.49%, which is lower than the overall national rate of 3%.

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Answer:

Vertical shrink by 2

Step-by-step explanation:

Multiplying by 2 stretches the function. It does not shrink it.

Answer: Vertical shrink by 2

Mr. Schwartz will need to order more wheels after building 12 cars.

The number of cars x Mr. Schwartz builds before he places an order for more wheels can use the following steps:

Determine how many wheels are used per car:

4 wheels/car

Determine the number of wheels available at the start of the week:

85 wheels

Determine the minimum number of wheels needed to be available before placing an order:

40 wheels

Set up an inequality to represent the situation using x to represent the number of cars built before an order is placed:

Number of wheels used = 4x

Number of wheels remaining = 85 - 4x

Order is placed when number of wheels remaining is less than 40:

85 - 4x < 40

Solve for x by isolating the variable:

85 - 4x < 40

-4x < -45

x > 11.25

Since x represents the number of cars built can't have a fractional value for x.

The nearest integer to get the minimum number of cars that need to be built before an order is placed:

x > 12

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