Ineed the answer of this literal equations p=a+b+c

Isee the amount was $90.00 then reduced to $75.00 , what is the percent ?

What value of x will make the triangles similar by the sss similarity theorem?

Monica build a remote control toy airplane for science project to test the plane she launched it from the top of a building the plane travel a horizontal distance of 50 feet before landing on the ground a quadratic function which models the height of the plane in feet relative to the ground at a horizontal distance of x feet from the building is shown