3 which relation is not a function

What is the approximate circumference of the circle shown below?

After being rearranged and simplified, which of the following equations could be solved using the quadratic formula? check all that apply. a. 9% + 3x2 = 14 + x-1 b. -x+ + 4x + 7 = -32-9 c. 5x + 4 = 3x4 - 2 d. 2x2 + x2 + x = 30

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?