Ab=c+a solve for a

Can someone please show me how to solve this with each step?

Sam claims that cos x =sin y if x and y are congruent angels. is sam correct ?

Suppose your school costs for this term were $4900 and financial aid covered 3/4 of that amount. how much did financial aid cover? and how much do you still have to pay?

I’m on question 7 it says a covered water tank is in the shape of a cylinder the tank has a 28 inch diameter and a height of 66 inches to the nearest square inch what is the surface area of the water tank