PLEASE HELP ON THIS TOO! I need major help! Please explain it the best you can bc I rlly need help :(

A20? -foot ladder is placed against a vertical wall of a? building, with the bottom of the ladder standing on level ground 19 feet from the base of the building. how high up the wall does the ladder? reach?

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.

True or false: the graph of y=f(bx) is a horizontal compression of the graph y=f(x) if b< 1