Answer:
d) c = 4.20h
Explanation:
$25.20 for 6 hours is a unit rate of 25.2/6 = 4.2, or $4.20/hour
$16.80 for 4 hours is a unit rate of 16.8/4 = 4.2, or $4.20/hour
The unit rate is the constant of proportionality which is the slope.
The linear function is
c = 4.20h
Answer: d) c = 4.20h