Okay I am not 100% sure because that is an extremely confusing question. But here is what I got.
(A) 2c² = 2bc + ac/2 Given
(B) 4c² = 2bc + ac Multiplication and Distribution
(C) 4c = 4b + a Division and Distribution
(D) 4c - a + 4b Subtraction
(E) 4b = 4c - a Symmetric
The amplitude of this function is 4/5. Be sure you understand why that is so.
5(5r-7)=-185
25r - 35 = - 185
25r = - 150
r = - 6
