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Nastasia [14]
3 years ago
5

Please help on these questions​

Mathematics
1 answer:
Arada [10]3 years ago
8 0

Answer:

6) 9216π

8) 24

Step-by-step explanation:

6)

V= 2/3πr³

   r = 48/2 = 24

V = 2/3π24³

V = 9216π

8)

V = 4/3πr³

2304π = 4/3πr³

r³= (2304π)/4/3π

r³= 1728

\sqrt[3]{r^3} =\sqrt[3]{1728}

r = 12

D = 2r

D = 2 x 12 = 24

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1. Point (−5,8) is reflected across the line = . What are the coordinates of ′? Show your work and explain.
netineya [11]

Answer:

(5,8) over y axis and (-5,-8) over x axis

Step-by-step explanation:

4 0
4 years ago
(2xyz)(-4x^2yz)<br> polynomials<br> please help
OLga [1]

Hi!

Tip #1: To multiply polynomials, consider the variables separate from the numbers.

So we are multiplying 2xyz * -4x²yz

Let's start by multiplying the variables.

xyz * x²yz

Tip #2: The exponents tell you how many of each variable there are. When multiplying variables, add the exponents. When a variable does not seem to have an exponent, that means there is an invisible exponent of 1! (x = x^{1})

xyz * x²yz = (x + x²)(y + y)(z + z) = x³y²z²

Now multiply the numbers! (just like normal)

2 * -4 = -8

Now combine the numbers with the variables once again.

-8x³y²z²

The answer for 2xyz * -4x²yz is -8x³y²z²

Hope this helps! :)

7 0
3 years ago
A line with a slope of 2 passes through (3,9). Which choice is an equation of this line?
Veronika [31]

Answer:

The answer to your question is number 3.

Step-by-step explanation:

Data

slope = m = 2

Point = (3, 9)

Process

1.- Write the equation of the line in the form point-slope

               y - y1 = m(x - x1)

2.- Identify the values of x1 and y1

        x1 = 3   y1 = 9

3.- Substitution

               y - 9 = 2(x - 3)

4.- Simplify

              y - 9 = 2x - 6

              y = 2x - 6 + 9

5.- Result

              y = 2x + 3       slope y-intercept form

6 0
3 years ago
Carla and Frank can each wash a car and clean the interior in 2 hours, but Missy needs 3 hours to do the work. If the three work
irina1246 [14]

Remark

Start by figuring this out for 1 car. Worry about the 7 part when you find 1.

This problem is used quite frequently in physics. For example resistors in parallel use the same equation.

Formula

1/frank + 1/carla + 1/missy = 1/ time taken to do 1 mar.

Givens

Frank = 2 hours

Carla = 2 hours

Missy = 3 hours.

Substitute and Solve

1/2 + 1/2 + 1/3 = 1/Three_together.

3/6 + 3/6 + 2/6 = 1/Three_together.

8/6 = 1/Three_together. Cross multiply

8 * Three_Together = 6*1

8 * Three_Together = 6 Divide by 8

Three_Together = 6/8 = 3/4 = 0.75 hours. or 45 minutes for 1 car

Seven Cars

For 7 cars multiply 0.75 by 7

7 * 0.75 = 5.25 hours. <<<< Answer

7 0
3 years ago
Three businesses donated money to charity. The chart shows the pledges made by the businesses. Business B pledged $20 million le
Masja [62]

Answer:

Business A= x

Business B= 2x-2,000,000

Business C= 2(2x-2,000,000)-2,000,000

Step-by-step explanation:

Don't feel like explaining this unless you really want me to. Also, brainliest would really be appreciated.

8 0
3 years ago
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