Will anybody mark me Brainllest today if I answer questions?

Answer:

no

Step-by-step explanation:

x²-2x-5=0

a=1

b=-2

c=-5

So also you need to correct the equasion according to the schematic below:

x=(-b+-root(b²-4*a*c))/2*a

Answer:

Bella is largely mistaken.

Step-by-step explanation:

What she described equals 90

Answer:

942 6/7 cm²

Step-by-step explanation:

Since O = Center of bigger circle, OA = Radius of bigger circle.

∴ Area of smaller circle - Area of bigger circle = Area of shaded part.

∴ Area of smaller circle = 22/7 × 10²

                                       = 22/7 × 100

                                       = 2200/7

                                       = 314 2/7 cm²

∴ Area of bigger circle = 22/7 × 20 ²

                                      = 22/7 × 400

                                      = 1257  1/7 cm²

∴ Area of shaded part = 1257 1/7 - 314 2/7

                                     =  942 6/7 cm²

Answer:

x = 14

Step-by-step explanation:

It is a 6 sided shape so 6 -2 x 180 = 720 degrees sum of exterior angles

10 x + 6x+10 +9x+4 +7x+2 +12x-8 +8x-16 = 720

52 x - 8 = 720

52x = 728

x =14

Answer:

450

Step-by-step explanation:

6% = 0.06

0.06x = 27

Divide both sides by 0.06

x = 450

Answer:

54

Step-by-step explanation:

Answer:

486

Step-by-step explanation:

Area of a parallelogram = base length times height

The parallelogram shown has a height of 18 mm and a base length of 27 mm

Thus, area = 27 * 18

27 * 18 = 486

Thus, the area of the parallelogram is 486mm²

Answer:

Option D

Step-by-step explanation:

Equation of the piecewise function,

f(x) = -x² + 2x  for x ≤ -3

        [tex]2(\frac{1}{3})^{2x}[/tex] for -3 < x < 4

         [tex]\frac{2x-5}{x-7}[/tex] for x ≥ 4

For x = -3,

f(x) = -x² + 2x

f(-3) = -(-3)² + 2(-3)

       = -9 - 6

       = -15

For x = -1

f(x) = [tex]2(\frac{1}{3})^{2x}[/tex]

f(-1) = [tex]2(\frac{1}{3})^{2(-1)}[/tex]

      = [tex]2(\frac{1}{3})^{-2}[/tex]

      = [tex]2\times 3^2[/tex]

      = 18

For x = 4

f(x) = [tex]\frac{2x-5}{x-7}[/tex]

f(4) = [tex]\frac{2(4)-5}{4-7}[/tex]

     = [tex]\frac{3}{-3}[/tex]

     = -1

Therefore, f(-3) + 2f(-1) + f(4) = -15 + 2(18) - (-1)

                                              = -15 + 36 + 1

                                              = 22

Option D will be the correct option.

Answer:

y(t) = 720e^0.3466t

y = 2036.6288

Step-by-step explanation:

The exponential relation :

y = Ae^kt

A = initial value ; y = final value ; r ; k = exponential rate, t = time

At t = 0

y = 720e^0 ; y = 720

At t = 2 ; y = 720e^2k

1440 = 720e^2k

1440/720 = e^2k

2 = e^2k

Take the In of both sides

0.6931471 = 2k

k = 0.6931471 / 2

k = 0.3466

Hence, equation becomes :

y = 720e^0.3466t

After 3 hours ;

t = 3

y = 720e^0.3466*3

y = 720e^1.0398

y = 720 * 2.8286512

y = 2036.6288

Answer:

D

Step-by-step explanation:

Answer:

d

Step-by-step explanation:

Step-by-step explanation:

Therefore the third side should be less than 12+15 = 27cm

And also the third side cannot be less than the difference of the two sides

Therefore, the third has to be more than 15-12 = 3cm

Thus, the third side could be the length more than 3cm and less than 27cm.

Answer:

Step-by-step explanation:

Let the equation of the function is,

y = mx + b

Here, m = slope of the function

b = y-intercept

y-intercept of function is the y-value of a point where x = 0.

From the table given,

y-intercept 'b' = 1

Slope of the line passing through two points [tex](x_1,y_1)[/tex] and [tex](x_2,y_2)[/tex] is given by,

Slope = [tex]\frac{y_2-y_1}{x_2-x_1}[/tex]

Slope of the line passing through (2, 6) and (4, 2) will be,

Slope = [tex]\frac{6-2}{2-4}[/tex]

          = [tex]-2[/tex]

Equation of the line will be,

y = -2x + 1

B). Slope of the line = -2

x-intercept of the line (at y = 0),

y = -2x + 1

0 = -2x + 1

x = [tex]\frac{1}{2}[/tex]

y-intercept of the line = 1

y-intercept indicates that the power of the battery was 100% when we turn on the laptop.

C). Equation of the line is,

y = -2x + 1

Here, y = power remaining

x = Hours

For y = 75% ≈ 0.75

0.75 = -2x + 1

0.75 - 1 = -2x

-0.25 = -2x

x = 0.125

Therefore, after 0.125 hours battery power will be 75%.

The slope means that the percentage decrease by 20% each hour, the y intercept means that the battery was 100% at start.

A linear equation is in the form:

y = mx + b

where y, x are variables, m is the rate of change and b is the initial value of y.

Let y represent the percent of battery after x hours.

From the table using the points (0, 1) and (4, 0.2):

[tex]y-y_1=\frac{y_2-y_1}{x_2-x_1} (x-x_1)\\ \\ y-1=\frac{0.2-1}{4-0}(x-0)\\ \\ y=-0.2x+1[/tex]

At y = 75% (0.75):

0.75 = -0.2x + 1

x = 1.25 hours

The slope means that the percentage decrease by 20% each hour, the y intercept means that the battery was 100% at start.

Find out more on linear equation at: https://brainly.com/question/14323743

Answer:

-7 & 5

Step-by-step explanation:

Answer:

Factors = - 7 and 5

Step-by-step explanation:

- 35

- 1 and 35

- 5 and 7

- 7 and 5

- 35 and 1

35 - 1 = - 34

- 5 + 7 = 2

- 35 + 1 = - 34

- 7 + 5 = - 2

Factors = - 7 and 5

Answer:

456

Step-by-step explanation:

The volume of the triangular prism is equal to 456 cubic units.

A triangular prism is a polyhedron constructed of two triangular bottoms and three rectangular flanks. It is a three-dimensional body that has three flank faces.

A prism is a polyhedron in geometry that has n parallelogram faces that connect the n-sided polygon basis, the second base, which is a translated duplicate of the first base, and the n faces.

The volume of the rectangular prism will be calculated by the formula given below:-

V = Bh

B = Area of the base.

h = height of the prism.

From the figure, we can see that the triangular base has a height of 6 and a base of 8 units.

Area of the Base = 6 x 8 = 48 square units.

The volume of the prism will be,

V = 48 x 19

V = 456 cubic units.

Therefore, the volume of the triangular prism is equal to 456 cubic units.

To know more about the volume of the prism follow

https://brainly.com/question/23963432

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Answer:

a) A = 8000(1 + .06/4)^4t

b) $9,564.95

Step-by-step explanation:

b) A = 8000(1 + .06/4)^12

Answer:

Probability is represented as a non-negative number between 0 and 1.

Answer: The Answer is 3rd

Answer:

14mph

Step-by-step explanation:

First, lets find how many 16s can go into 60.

We can find this by doing 60 / 16 = 3.75

Then we need to find his average speed. We can find this by doing

18.4 * 3.75 = 69

To find how much he exceeded the speed limit, we will subtract 55 from 69

69 - 55 = 14

Therefore, Femi's average speed exceeded the speed limit by 14mph.

Answer:

-3, 4

Step-by-step explanation:

See the image below:)

Answer:

Step-by-step explanation:

1 inch

Answer:

Step-by-step explanation:

36 by 24 in. all you have to do is look at B, hopefully this helps!

Answer:

For the first one its: Volume = 402.12in³

For the second one its: Volume = 201.0619 in³

Step-by-step explanation:

For the first one work:

Volume = 3.1416 x 42 x 8

= 3.1416 x 16 x 8

For the second one work:

Volume = 3.1416 x 42 x 4

= 3.1416 x 16 x 4

Answer:

the formula is : V=πr2h

the volume of the first cylinder is 402.12cm³ and the second is 201.06cm³ (these answers are rounded to two decimal places)

Step-by-step explanation:

Volume is pi times the radius squared (which is 4 in both these cylinders) times the height of the cylinder which is 8 in the first cynlinder and 4 in the second.

Answer: B

Step-by-step explanation:

Answer:

C

Step-by-step explanation:

Hii I hope this helps I'm a bit rusty on this stuff but I'm sure it right

Answer:

C; D; E

Step-by-step explanation:

✔️Angles in a straight line = 180°

Therefore, m<5 + m<6 = 180° is correct.

✔️Exterior angle of a triangle = the sum of the opposite interior angels based on the exterior angle theorem of a triangle.

Therefore,

m<2 + m<3 = m<6 is correct.

✔️The sum of m<2 + m<3 + m<5 = 180° is correct. This is true based on the sum of triangle theorem.

Answer:

78.3% which would be a C+

Step-by-step explanation:

If the project was worth 20% of your grade and you got 50% on that project, we can multiply the decimal values of these percentages together to know exactly by how much your grade will drop.

0.2 * 0.5 = 0.1 or 10%

Now, we see that your grade will drop 10%. Meaning, that from your 87% you will actually have only 90% of that which is...

87 * 0.90 = 78.3

Therefore, your grade will go down to a 78.3% which would be a C+

Answer:

D. The new volume is twenty-seven times the old volume.

Step-by-step explanation:

Old volume:

Volume = length x width x height

Volume = 8 x 4 x 2

Volume = 64

New volume:

Volume = length x width x height

Volume = 24 x 12 x 6

Volume = 1,728

1,728 divided by 64 = 27

Final Answer: 27

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Answer:

The ratio of quarters to nickels is:

Step-by-step explanation:

To solve the exercise, you must first consider how big is the ratio of each one to the other, when it is mentioned that the ratio of quarters to dimes is 5:2 it means that for every 5 quarters, Jon has 2 dimes, for the more quarters there are with respect to the dimes, we simply divide the larger value by the smaller:

Thus, we know that there are 2.5 more quarters than dimes. Now the following proportion: the ratio of dimes to nickels is 3:4, which means that for every 3 dimes there are 4 nickels, as the nickels are greater in quantity, we are going to see how many times they are greater in proportion than the dimes making again a division of the major over the minor:

As we can see, the nickels are a little more than 1 with respect to the dimes, now we are going to create two formulas with those values:

Where:

As you see. We only express the calculated proportions, at first glance you can identify that the number of quarters is greater, but to know how much greater with respect to nickels we are going to divide the two values ​​that accompany "d" in the formulas:

If we express it in ratio as it is in the exercise, we obtain:

So, 15:8 is the ratio of quarters to nickels, which means that for every 15 quarters, jon has 8 nickels.