HELP me please

Simplify (a/b - b/a) times (a - a^2/a+b) a - a^2/a=b is a mixed number

Solve the triangle. a = 21°, c = 105°, c = 5

Ms. ortiz sells tomatoes wholesale. the function p(x)=-80x^2+320x-10, graphed below, indicates how much profit she makes on a load of tomatoes if she makes on a load of tomatoes if she sells them for 4-x dollars per kilogram. what should ms. ortiz charge per kilogram of tomatoes to make on a load of tomatoes?