What is 21^2+a=29^2 what is the value of a in pythagoren therom

If a company produces x units of an item at a cost of $35 apiece the function c=35x is a of the total production costs

Add, subtract, multiply, or divide as indicated. list any restrictions for the variable(s) and simplify the answers when possible. 1) x-2 / x+5 + 3x / 2x-1 2) x+6 / x-6 - x^2 / x+6 3) x+9 / x-4 + x+2 / x^2-11x+28 4) x / x^2-64 + 11 / 2x^2+11x-40 5) 5 / x + 11 / x-3 - x-4 / x^2+2x-15

If 5x - 2 = -12, then x = a) -50 b) -4.4 c) -2.8 d) -2