How does the volume of a cylinder change if the radius is quadrupled and the height is reduced to a third of its original size?

a. v= 1/3 pie r^2 *h
b. v= 2/3 pie r^2 * h
c. v= 4/3 pie r^2 * h
d. v= 16/3 pie r^2 * h

Jessa bought a yoyo from a company that claims that, with each retraction, the string rolls up by 60% of the original length. she sets up a tape measure and throws the yoyo 3 times. her data are charted below. throw length of string (feet) 1 3 2 1.8 3 1.08 jessa wants to find the sum of the length of string after 10 throws. what is the sum of the lengths, rounded to the nearest hundredth?