Answer:
A
Step-by-step explanation:
Let the radius be: r and height be h
volume = πr²
if the radius is halved then radius = r/2
and height is doubled, so height= 2h
volume = πr*r/4*2h = π*r²*h/2
Thus the volume will be halved.
If then
If then first 300 minutes are free and each minute of next (x-300) minutes costs $0.39, therefore the answer is B :)
Answer:
y = 60, x= 50
Step-by-step explanation:
y + 120 = 180
subtract 120 from both sides
y = 60
60 + 70 = 130
x + 130 = 180
subtract 130 from both sides
x = 50
Answer:

Step-by-step explanation:
First, find the slope using the points (3, 2) and (-1, -1):
Slope = 
Find the y-intercept, b, by substituting x = -1, y = -1 and m = ¾ in y = mx + b.
-1 = ¾(-1) + b
-1 = -¾ + b
Add ¾ to both sides
-1 + ¾ = b
(-4 + 3)/4 = b
-¼ = b
Substitute m = ¾ and b = -¼ in y = mx + b.
The equation would be:
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