Find the mean and median of the data set. 39, 21, 15, 13, 12

The mean is-
The median is-

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

The approximate line of best fit for the given data points, y = −2x − 2, is shown on the graph. which is the residual value when x = –2? a)–2 b)–1 c)1 d)2

Ratio of circumference to diameter example plz i need to now what it looks like.