Hello!
To find the surface area of a cylinder you use the equation

SA is surface area
r is radius
h is height
PUt in the values you know

Square the number

Multiply 7 and 18

Multiply 126 by 2

Multiply the 49 by 2

Add

The answer is

Hope this helps!
XD You posted this 7 days ago
Anyway, He can buy 3
Hope this helps! :)
You devide by 4 and it is 21 over 25
f(x) = 5x + 1
f(4) = 5 * 4 + 1
f(4) = 20 + 1
f(4) = 21
g(x) = 2x² - 3x +1
g(5) = 5 * 5² - 3 * 5 + 1
g(5) = 125 - 15 + 1
g(5) = 111
f(4) + g(5) = 21 + 111 = 132
I think the answer is 0.62