4. What effect does doubling the radius of a cylinder have on the area of the base of the cylinder? a. The area of the base is doubled.
b. The area of the base is quadrupled.
C. The area of the base is halved.
d. The area of the base is multiplied by one-fourth.​

In order to find the volume of a cylinder, you would use the formula V=3.14*r2*h. In the formula, the radius is being squared. That means that doubling the radius of the cylinder will quadruple the volume. For example, let's say we have a cylinder with a radius of 2 inches and height of 3 inches,

Step-by-step explanation: I hope this helped?

1. 0.3 •4 is the same as 4 groups of 0.32. 7•0.8 is the same as 7 groups of 0.83. it increases by 0.5 every time, so 0.5x4 it increases by 0.9 every time, so 0.9x5. 0.9•12=10.86. 0.47•5=2.35i can finish the next ones in a separate post