It's C x5 the correct answer I'm not sure
To find the original pricing you must cross multiply
the answer would be 1450
B. the slope is positive because its in a straight line
F(x+h) = 2(x+h) +3= 2x + 2h +3
f(x) = 2x + 5
f(x+h) - f(x) = 2x + 2h + 3- 2x - 3= 2h
[f(x+h) - f(x)]/h = 2h/h = 2