What is the exact volume of the cylinder?
4 in.
327 in
8 in.
O 647 in
O 1287 in
O 5127 in

The exact volume is 128 pi

Step-by-step explanation:

The volume of a cylinder is

V = pi r^2 h

V = pi ( 4)^2 (8)

V = pi (16*8)

  = pi 128

The exact volume is 128 pi

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it

a 4/6 = 9/12   not proportional

step-by-step explanation:

to find which are not proportional, we can use cross products

if it is true, they are proportional.   if it is not true, they are not proportional.

a 4/6 = 9/12

4* 12 = 6*9

48 = 54

not this is not proportional  

b 2/3 = 12/18  

2* 18 = 3 * 12

36 = 36

this is proportional

c 5/4 = 10/8  

5*8 = 4*10

40 = 40

this is proportional

d 7/5 = 35/25

7*25 = 5 * 35

175 = 175

is proportional