Whats the answer to this problem I need a quick answer like NOW !!! help im being timed

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?

One side of a rectangle is 7 centimeters shorter than six times the other side. find the length of the longer side if we also know that the perimeter of the rectangle is 266 centimeters.

Plz asap what is the range of the cluster in the scatter plot a. between 4 and 8 years of experience b. between $40,000 and $60,000 c. between 6 and 12 years of experience d. between $10,000 and $60,000