If f(x) = -0.5x + 2.5 what is f(x) = 0 and what is f(0) ?

A) To find x for f(x) = 0, substitute the given information and solve for x.
.. f(x) = 0 = -0.5x +2.5
.. 0.5x = 2.5 . . . . . . . . . . add 0.5x
.. x = 2.5/0.5 = 5 . . . . . . divide by the coefficient of x

f(5) = -0.5*5 +2.5 = 0

b) f(0) = -0.5*0 +2.5 = 2.5