First use Pythagoras theorem to find the length |DE|. Next use the sine rule
Answer: f^-1(x) = (y - 7)/11
Explanation:
f(x) = 11x + 7
y = 11x + 7
y - 7 = 11x
(y - 7)/11 = x
Large box --> M
Small box --> m
M+m=80
70M+60m=5300
Now solve this system of equations. Very easy job now.
I think it is -28?????????
