If varies directly as y and y = 15 when = 25. If = 155 then y is

y = 93

Step-by-step explanation:

I assume the other variable is x.

"If x varies directly as y and y = 15 when x = 25. If x = 155 then y is"

Direct variation:

x = ky

25 = k * 15

k = 25/15

k = 5/3

The direct variation equation is

x = (5/3)y

155 = (5/3)y

y = 155 * 3/5

y = 93

Step-by-step explanation:

V = B * h

B = pi r^2

r = 12 km

B = 12^2 * pi

B = 144 * pi

h = 7 km

Volume = 144 *7 * pi

Volume = 1008 * pi

Volume = 3165.1