Question

HELP ASAP PLZ MEDALS WILL BE GIVEN OUT!!! A stack of quarters is packed in a plastic tube 4 inches tall. The diameter of each quarter is 0.94 inch. What is the approximate surface area of the cylinder formed by the stack of coins? (Use 3.14 for .)

Answer 1

the formula for finding the surface area of a cylinder is 2πrh+2πr^2, with r being the radius and h being the height. substitute in your numbers. your height is 4, and radius is half of the diameter of the quarter, so .47.
2π(.47)(4)+2π^2
then just do the math
2π(1.88)+2π^2
3.76π+2π^2
11.8064+19.7192
31.5256

Answer 2

this came out weird, sorry. all of the question marks just means one pi sign

Answer 3

here

2(3.14)(.47)(4)+2(3.14)^2
then just do the math
2(3.14)(1.88)+2(3.14)^2
3.76(3.14)+2(3.14)^2
11.8064+19.7192
31.5256

Answer 4

for future reference google "surface area formula for a cylinder" and just input the height and radius. that gives me a little bit of a different answer (13.2) not sure why

Answer 5

a 18.4 in2
b 2.77 in2
c 13.19 in2
d 3.76 in2
@kah.x these r the answer choices