The sum of 5 times one number, x, and 4 times a second number, y, is 87. If the sum of the two numbers is 20, find the two numbers. Pls hurry need it before schools is over (hint will mark brainiest)

Step-by-step explanation:

We have 5x + 4y = 87 and x + y = 20.

=> 5x + 4y = 87 and 4x + 4y = 80.

5x + 4y = 87

- (4x + 4y = 80)

=> x = 7

Therefore (7) + y = 20, y = 13.

The answers are x = 7 and y = 13.

Step-by-step explanation:

D = 8 cm

r = 8/2  = 4 cm

h = 18 cm

Surface area = 2πr(h + r)

  =2*π * 4 * ( 4 + 18)

  = 2*π*4*22

 =176π cm²