Please help me if you don’t mind

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

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.

Peter measures the angles in a triangle. he finds that the angles are 95, 10 and 75. is he correct? explain your answer