The volume of a cylinder is about 402 cubic inches. the height is 2 times the cylinder’s radius. what are the radius and height of the cylinder?

r=4 inch

              H=8 inch

Step-by-step explanation:

V=402 inch³

H=2r

V=Hr²π

402=2r*r²π

402=2r³π

402/2π=r³

64=r³

r=4

H=2*4=8

the answer is d on edge

step-by-step explanation:

hello from mrbilldoesmath!

answer:

25x^2 + 90x + 84

discussion:

mn(x) = m(n(x)) = m( 5x + 9) =

(5x + 9)^2 + 3 =>

25x^2 + 90x + 9^2 + 3 =

25x^2 + 90x + 84                 (as 9^2 = 9*9 = 81)

which is the second choice

regards,  

mrb

p.s.   i'll be on vacation from friday, dec 22 to jan 2, 2019. have a great new year!