Answer:
(x) =
Step-by-step explanation:
let f(x) = y, then y = 2x + 1
rearrange, making x the subject
subtract 1 from both sides
y - 1 = 2x ( divide both sides by 2 )
x =
change y back into terms of x
3 goes 1, 4 goes 2, 1 goes 3 and 2 goes last
32 years old
Reverse what the teacher said. Half 120 to get 60. Subtract 28 from 60. The teacher is 32.