I NEED HELP PLEASE!

Question

A can of beans has surface area 342 cm^2. Its height is 12 cm. What is the radius of the circular top? (hint: The surface area consists of the circular top and bottom and a rectangle that represents the side cut open vertically and unrolled.)

Answer 1

first write the equation for the SA of a can:

2 *pi r squared + 2 pi r h = 342

solve for r using the quadratic formula

r = 3.51 (rounded)