Let abc be a right triangle with the right angle at a, p ∈ (bc) such that ap ⊥ bc, e the midpoint of (ac) and f the midpoint of (ab). prove that the angle ep f is right.

Can someone explain the elimination method to me for this problem?

Janie has $3. she earns $1.20 for each chore she does and can do fractions of chores. she wants to earn enough money to buy a cd for $13.50. write an inequality to determine the number of chores, c, janie could do to have enough money to buy the cd.

The letters g e o r g i a are placed in a bag . if you picked a card and knew it was a vowel , what is the probability that it is an a ?