How far from the base of the house do you need to place a 15’ ladder so that it exactly reaches the top of a 12’ wall?

Question and answers are in the attached picture. you so much in advance.

Which of the following of the following sets of side lengths could not form a triangle?

Amerchant has coffee worth $60 a pound that she wishes to mix with 50 pounds of coffee worth $90 a pound to get a mixture that she will sell for $70 a pound. how many pounds of the & 60 coffee should be used?