Geometry question 3, Thanks if you help!

A25- foot ladder leans against a building and reaches a point of 23.5 feet above the ground .find the angle that the ladder makes with the building

To finance her community college education, sarah takes out a loan for $2900. after a year sarah decides to pay off the interest, which is 4% of $2900. how much will she pay

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