Find the circumference of a circle with a radius of 12.5mm

this is a geometry question

Which of the following best describes the graph below? a. it is a function, but it is not one-to-one. b. it is a one-to-one function. c. it is not a function. d. it is a many-to-one function.

On average, how many more hits will he get when he bats 100 times at home during the day as opposed to 100 times away at night?

Find the roots of the polynomial function f(x) = x^3 + 2x^2 + x