Find the following when a = -2, b = 3, c = -1/3

your options are

a) -21/2
b) 17/2
c) 4/2
d) 21/2

Maybe try
f(x) = 7 − 3x
(a) 
f(a) 
Incorrect: Your answer is incorrect. 
(b) 
f(−a) 

(c) 
−f(a) 

(d) 
f(a + h) 

(e) 
f(a) + f(h) 

(f) 
f(a + h) − f(a)
h
, if h ≠ 0 
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If a and h are real numbers, find the following values for the given function.
f(x) = 7 − 3x
(a) 
f(a) = 7-3a

(b) 
f(−a) = 7-3(-a) = 7+3a

(c) 
−f(a) = -(7-3a) = 3a-7

(d) 

f(a + h) = 7 -3(a+h) = 7-3a-3h

(e) 
f(a) + f(h) = (7-3a)+(7-3h) = 14-3a-3h

(f)
if h ≠ 0,

[f(a + h) − f(a)]/h = {[7-3a-3h]-[7-3a]}/h = [-3h]/h = -

When i did the math i got 11 cm