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Effectus [21]
2 years ago
10

Theresa is planning to make a plastic cover for her new globe to keep it from being damaged. If Theresa’s new globe has a radius

of 3 inches, then how much plastic will it take to cover her new globe?
A. 18(3.14) square inches
B. 72(3.14) square inches
C. 288(3.14) square inches
D. 36(3.14) square inches
Mathematics
1 answer:
sveticcg [70]2 years ago
4 0

Answer:

D

Step-by-step explanation:

The amount of plastic needed to cover the globe is the surface area of the globe. Since a globe is a sphere, the formula is SA = 4/3 πr³. Substitute r= 3 inches.

SA = 4/3 π(3)³ = 4/3 π * 27 = 36π

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Explanation:

The slope is 3, so m = 3

The given point is (3,1) meaning x = 3 and y = 1. The x coordinate is always listed first in an ordered pair. The general format is (x,y)

We'll use m = 3, x = 3 and y = 1 to find the y intercept

y = mx+b
y = m*x+b
1 = 3*3+b ... plug in m = 3, x = 3 and y = 1
1 = 9+b
1-9 = 9+b-9 ... subtract 9 from both sides
-8 = b
b = -8

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

So we're given m = 3 as the slope and we just found that b = -8 is the y intercept

So y = mx+b updates to y = 3x-8. This is the final answer.

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

Side Notes:
* The slope of 3 means rise/run = 3/1 indicating each time we go up 3, we move to the right 1
* The y intercept -8 is the location on the vertical y axis numberline where the graph crosses. The point (0,-8) is on this line.

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3 years ago
Pls help me out on this ill will give brainiest for the best answer
Svetach [21]

Answer:

Step-by-step explanation:

butt

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