free brainly to the correct answer

Answer:

250 kg of 17% and 150 kg of 25%

Step-by-step explanation:

For answering this, we do it by proportions.

take the difference

17%  ===  20% === 25%

         3              5

Then ratio

17% :25% = 5:3

For 400 kg,

17% = 5/(5+3)  * 400 = 250 kg

25% = 3/(5+3) * 400 = 150 kg.

Above is a mental method, no calculation or pencil need.

I will edit to give an algebraic method.

Algebraic method:

Given:

17% rods and 25% rods.

Need to make 400 kg of 20% rods.

Let  

A=weight of 17% rods

B=weight of 25% rods

to make 20% rods, we need  

( 0.17A + 0.25B ) / (A+B) = 0.20  ............(1)

But we know that  

A+B=400 .............(2)

substitute

B=400-A in (1)

( 0.17A + 0.25 (400-A) ) / 400 = 0.20

Cross multiply and simplify

(0.17-0.25)A +100 = 80

-0.08A = -20

A = -20 / (-0.08)

A = 250 ...........(3)  (17% rods)

substitute (3) in (2)

B = 400-250 = 150   (25% rods)

Same answer as mental calculations

Even simpler albebra, same answer!

Given:

17% rods and 25% rods.

Need to make 400 kg of 20% rods.

Let  

W=weight of 25% rods

400-W = weight of 17% rods

To make 20% purity rods, we need to have 400*0.2=80 kg of pure metal, which is

0.25W + 0.17(400-W) = 80

Expand and simplify

0.25W + 68 - 0.17W = 80

0.08W = 80-68 = 12

W = 12/0.08 = 150  (25% rods)

400-W = 250 kg (17% rods)

Answer:

245432

Step-by-step explanation:

Angela uses  cup of strawberries to make  of a liter of smoothie. What is the unit rate in cups of strawberries per liter of smoothie?

Answer:

-6

Step-by-step explanation:

Just did the test and -6 was the right answer.

Answer:

This is an extremely easy question. Your correct answer is 1/7,200 or 0.01389%

Step-by-step explanation:

Since you have to choose the three numbers and one super ball to be able to win the lottery, your chances of getting 3 white numbers is 1/10 x 1/9 x 1/8 = 1/720

The chances of getting the super ball is 1/10

And the chances of winning the jackpot is 1/720 x 1/10 = 1/7,200 = 0.01389%

Answer:

a

Step-by-step explanation:

Recall that the "point-slope" form of a linear equation may be expressed as

y = mx + b,

where  m is the gradient.

If m is negative, the gradient is negative.

If m is positive, the gradient is positive.

In our case, if we consider option A,

x + 3y = -2  (rearranging)

3y = -x -2

y = (-1/3) x - (2/3)

if we compare this to the general equation at the top, we can see that

gradient, = m = (-1/3) which is negative.

hence option a has a negative gradient.

Answer:

A. x+3y = -2

y  = mx+b

3y = -x-2

m = -1

Step-by-step explanation:

Answer:

C   x<-2 or x>_ 4

Step-by-step explanation:

Dont get corona!

Answer:

1. [tex]-5x+3y+44=0[/tex]

2. [tex]2x+y-2=0[/tex]

3. [tex]2x+y-4=0[/tex]

Step-by-step explanation:

Standard form of a line is [tex]Ax+By+C=0[/tex].

If a line passing through two points then the equation of line is

[tex]y-y_1=m(x-x_1)[/tex]

where, m is slope, i.e.,[tex]m=\dfrac{y_2-y_1}{x_2-x_1}[/tex].

1.

The line passes through the points (7,-3) and (4,-8). So, the equation of line is

[tex]y-(-3)=\dfrac{-8-(-3)}{4-7}(x-7)[/tex]

[tex]y+3=\dfrac{-5}{-3}(x-7)[/tex]

[tex]y+3=\dfrac{5}{3}(x-7)[/tex]

[tex]3(y+3)=5(x-7)[/tex]

[tex]3y+9=5x-35[/tex]

[tex]-5x+3y+9+35=0[/tex]

[tex]-5x+3y+44=0[/tex]

Therefore, the required equation is [tex]-5x+3y+44=0[/tex].

2.

We need to find the equation of the line, in standard form, that has a y-intercept of 2 and is parallel to [tex]2 x + y =-5[/tex].

Slope of the line : [tex]m=\dfrac{-\text{Coefficient of x}}{\text{Coefficient of y}}=\dfrac{-2}{1}=-2[/tex]

Slope of parallel lines are equal. So, the slope of required line is -2 and it passes through the point (0,2).

Equation of line is

[tex]y-2=-2(x-0)[/tex]

[tex]y-2=-2x[/tex]

[tex]2x+y-2=0[/tex]

Therefore, the required equation is [tex]2x+y-2=0[/tex].

3.

We need to find the equation of the line, in standard form, that has an x-intercept of 2 and is parallel to [tex]2x + y =-5[/tex].

From part 2, the slope of this line is -2. So, slope of required line is -2 and it passes through the point (2,0).

Equation of line is

[tex]y-0=-2(x-2)[/tex]

[tex]y=-2x+4[/tex]

[tex]2x+y-4=0[/tex]

Therefore, the required equation is [tex]2x+y-4=0[/tex].

Answer:

Volume ≈ 138.3

Step-by-step explanation:

[tex]V = \pi r^2 h\\h = 11in\\d = 4in \\r = d/2 = 4/2 = 2\\\\V= \frac{22}{7} \times 2^2 \times 11\\V = \frac{22}{7} \times 4 \times 11\\V = 22/7 \times 44\\\\V = 968/7\\\\V = 138.2857[/tex]

Answer:138.2

Step-by-step explanation: n(2)^2(11) = 138.2300768 = 138.2

Answer:

Lowest value:  24

Highest value:  84

Spread:  60

Center value: mean = 52.11

median = 53

Step-by-step explanation:

Given data

35. 42, 65, 59,84.62.46. 52,24

let arrange is from smallest to largest

24, 35, 42, 46, 52, 59, 62, 65,84

Thus,

Lowest value = 24

Highest values = 84

Spread is the range of data

range is difference of highest and lowest value

spread = 84-24 = 60

Center value is mean and/or mean of data

mean = sum of data/ no. of data

no. of data = 9

mean = 24+ 35+ 42+ 46+ 52+ 59+ 62+ 65+84/9 = 469/9 = 52.11

median is the middle term when data is arranged in ascending order.

median is (n+1)/2 th term when no. of data is odd

median is (9+1)/2th term = 5th term

5 th term is 52

thus, median is 52.

Thus, solution is

Lowest value:  24

Highest value:  84

Spread:  60

Center value: mean = 52.11

median = 53

Answer:

A: d= every time she walks the dog

   b= every time she babysits

B: 8d+12b

Brainlyest pls

Answer:

A: d= every time she walks the dog b= every time she babysits

B: 12b+8d

Step-by-step explanation:

I just did it.

Answer:

the ratio is 1:3

Step-by-step explanation:

Answer:

none

Step-by-step explanation:

If a squared variable is equal to a negative number, all of the solutions are imaginary

There are no real solutions

Answer:

The correct answer is none.

Answer:

  see below for classification

  concave: angles less than 180°

  regular: sides and angles congruent

  sum = 180°(n -2)

Step-by-step explanation:

A) The given shapes are classified and described in the attachment. (A polygon is a plane figure, so a "tripod" and a "dome" are not polygons.)

__

B) A convex polygon has interior angles that measure less than 180°. A concave polygon has one or more reflex angles.

__

C) A regular polygon has all angle measures congruent, and all side lengths congruent.

__

D) The sum of interior angles can be calculated from the formula ...

  angle sum = 180° · (n -2) . . . . where n is the number of sides

Answer:

see explanation

Step-by-step explanation:

Using the sine ration on the left, right triangle

sin35° = [tex]\frac{opposite}{hypotenuse}[/tex] = [tex]\frac{a}{8.6}[/tex] ( multiply both sides by 8.6 )

8.6 × sin35° = a , thus

a ≈ 4.93 cm

a + b = 15.7, so

4.93 + b = 15.7 ( subtract 4.93 from both sides )

b = 10.77

-------------------------------------------------------------

Using the cosine ratio on the left, right triangle

cos35° = [tex]\frac{adjacent}{hypotenuse}[/tex] = [tex]\frac{y}{8.6}[/tex] ( multiply both sides by 8.6 )

8.6 × cos35° = y , so

y ≈ 7.04 cm

Using Pythagoras' identity on the right, right triangle

c² = b² + y² = (10.77)² + (7.04)² = 115.99 + 49.56 = 165.55

Take the square root of both sides )

c = [tex]\sqrt{165.55}[/tex] ≈ 12.87 cm

Answer:

a) What is her average speed in mph?

= 65 mph

b) How many miles does Matthew drive?

=310 miles

Step-by-step explanation:

The average speed in meters per hour (mph) of Helen is 65 miles per hour

Given:

Total distance = 195 miles

Time taken = 3 hours

= 195 miles ÷ 3 hours

= 65 miles per hour

If Matthew drives at an average speed of 62 mph for 5 hours.

Total distance between traveled = Average speed × Time taken

= 62 mph × 5 hours

= 310 Miles

Therefore the total miles Helen traveled in 5 hours at the rate of 62 mph is 310 miles

Read more:

https://brainly.com/question/8406966

Answer:

Option (4)

Step-by-step explanation:

To calculate the volume of a pyramid we use the formula,

V = [tex]\frac{1}{3}(\text{Area of the base})(\text{Height of the pyramid})[/tex]

Area of the square base = (Side)²

                                         = (6)²

                                         = 36 square ft

Height of the pyramid 'h' = [tex]\sqrt{l^{2}-(\frac{\text{Side length of the base}}{2})^{2}}[/tex] [By Pythagoras theorem]

h = [tex]\sqrt{5^{2}-3^{2}}[/tex]

h = [tex]\sqrt{16}[/tex]

h = 4 ft

Therefore, volume of the given pyramid = [tex]\frac{1}{3}(36)(4)[/tex]

                                                                   = 48 cubic ft

Option (4). 48 ft³ will be the answer.

Answer:

Hello!

__________________

"If A, then B" is the form of a statement then it is conditional statement.

Hope this helped you!

:D

Answer:

c = -6

d = -1

Step-by-step explanation:

In the picture attached, the question is shown.

Shape A is composed of the points:

(3, 2)

(5, 2)

(3, 5)

Reflection across the x-axis transforms point (x, y) into (x, -y). Applying this transformation to shape A:

(3, 2) → (3, -2)

(5, 2) → (5, -2)

(3, 5) → (3, -5)

Translation (c, d) transforms (x, y) into (x+c, y+d). The point (3, -2) in the pre-image (before translation) corresponds to point (-3,-3) in the image (after translation). Therefore:

(3, -2) → (3+c, -2+d) → (-3,-3)

3+c = -3

c = -3 -3 = -6

-2+d = -3

d = -3+2 = -1

Answer:

A) 12.25 units

Step-by-step explanation:

From Pythagorean theorem:

Defining:

The system of equations is:

x + y = 625   (eq. 1)

36 + z = y     (eq. 2)

361 + z = x    (eq. 3)

Replacing equation 3 into 1:

361 + z + y = 625

From equation 2:

z = y - 36

Replacing it into equation 1:

361 + y - 36 + y = 625

2y = 625 + 36 - 361

y = 300/2

y = 150

Finally:

BC = √y

BC = √150

BC = 12.25 units

Answer:

The length of the hall way

the weight of the wombat

If the angle bisector also bisects the opposite side, then it's also a median *and* an altitude.  The triangle is isosceles.  

Draw the diagram: you have that altitude forming a pair of mirror-image right triangles.  In each, the short side is 1 and the hypotenuse is 2.  What does this tell you about the large triangle?

Then the rest you have to think... cuz it wasn't that hard.( If you still don't understand comment it, and then I will explain to you!)

HOPE IT HELP!

Answer:

The solution of given equation is (2,5)

Step-by-step explanation:

The equations give to us are:

y - 3 = x

or

y = x + 3

y = x² - 6x + 13

We can find the solution of the given system of equations by substituting each point in both of the equations. The point which satisfies both of the equation will be the solution of the the system of given equation.

Substitute (2,5) in both equations

y = x+3

5 = 2+3

5 = 5

TRUE

y = x² - 6x + 13

5 = 2² -6(2) + 13

5 = 5

TRUE

Similarly, we can also check the rest of the points, which come as FALSE.

Therefore, the solution of given equation is (2,5)

Answer:

Answer is C

Step-by-step explanation:

Answer:

A.64/50

Step-by-step explanation:

8/10*8/5

64/50

The least simplified form of the equation is 32/25

The simplified form of expression is option (D) 64/50 is the correct answer.

Simplification of an expression is the process of writing an expression in the most efficient and compact form without affecting the value of the original expression. It involves, multiply out the brackets and then simplify the resulting expression by collecting the like terms.

For the given situation,

The expression is (8/10)(8/5)

The simplified form of expression is

⇒ [tex](\frac{8}{10} )(\frac{8}{5} )[/tex]

⇒ [tex]\frac{64}{50}[/tex]

Hence we can conclude that the simplified form of expression is option (D) 64/50 is the correct answer.

Learn more about simplification of an expression here

https://brainly.com/question/13730519

#SPJ3

Answer:

1/10 or ( 0.1 )

Step-by-step explanation:

no. of even no.s greater than 80 = 10

Total no.of numbers = 100

So P(no. of even no.s greater than 80) = 10/100 = 1/10

Answer:

There are 10 even numbers greater than 80.

So Probability of getting an even numbers greater than 80 is 10/100 (1/10)

Hope it helps you. Please mark Brainliest :)

Have a nice day PPLS!!!!!!!

Answer:

C

Step-by-step explanation:

You can look them up in the graphs.

f(2) means "where is the blue graph when x=2?", and you can see it is at y=0.

Answer:

Step-by-step explanation:

d= distance

t= time

The independent variable is t, time. The distance the car travels depends on the time in hours spent travelling. The dependent variable is d, distance. Here is a table with 5 coordinate pairs that can be used.

(T)        (D)

1           30

2          60

3          90

4         120

5         150

These are the coordinate pairs for the function. When we use division and determine the rate of change, we can determine that the average rate of speed (MPH) is 30 MPH.

Answer:

[2, 6].

Step-by-step explanation:

Notice that there is a red line (graph) only for [2, 6].  Thus, the domain of this function is [2, 6].

Answer:

Approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956

Step-by-step explanation:

The formula to use to solve this question is called the Confidence Interval formula.

Confidence interval =

x ± z × ( σ/ (√n) )

Where:

x = the sample mean = 130

z = the z-value for 90% confidence = 1.645

σ = standard deviation = 7

n = sample size = 145

130 ± 1.645 × (7/√145)

130 ± 0.9562687005

130 - 0.9562687005 = 129.0437313

130 + 0.9562687005 = 130.9562687005

Therefore, approximately, the 90% confidence interval for the students' mean IQ score is between 129.045 - 130.956

Answer:

2 or less packs

Step-by-step explanation:

15.99 + 1.99g < 20.00  where g is the number of packs of gum

Subtract 15.99 from each side

15.99 + 1.99g - 15.99 < 20.00-15.99

1.99g < 4.01

Divide by 1.99

1.99g/1.99 < 4.01/1.99

g < 2.015075377

Harold must buy whole packs so g =2 or less

Answer:

x = 0   ,   x = -2

Step-by-step explanation:

The function given to us is:

f(x) = 3/2x - 5

g(x) = x² + 2x

We have to find the input x, for which the output of the function g(x) becomes 0.

It means that there is no use for the function f(x) in this question, so discard it

Substitute g(x) = 0 into the given equation of g(x):

g(x) = x² + 2x

0 = x² + 2x

Take x common from both the terms:

x(x+2) = 0

Thus, the values of x can be written as:

x = 0     ,     x + 2 = 0

x = 0     ,     x = -2