PLEASE I NEED HELP WITH MATH HOMEWORK I BEED AN EXPLANATION TOO!!
Question: find the value of the varible

Which graph represents an even function?

Someone answer asap for ! michele pushes a box d meters across a floor. she uses a force f, in newtons, to push the box. she pushes the box for t seconds. the formula p = fd/t calculates the power, p, in watts, that it takes for michele to complete the task. solve the formula for d.

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.