Question

The table below shows the relation between the number of hours worked babysitting and the total price for the services.
hours worked babysitting, h total price for services, c
4 $43
6 $63
8 $83
10 $103
​​Using the data shown above, which equation could be used to predict the total price for babysitting services?
A
c=h+39c=h+39c=h+39
B
c=8h+11c=8h+11c=8h+11
C
c=11h−1c=11h-1c=11h−1
D
c=10h+3c=10h+3c=10h+3

Answer 1

Find the rate: from 4 to 6 hours the price rises by $20, so slope = 20/2 = $10 per hour. Use c = 10h + b and plug (4,43): 43 = 40 + b → b = 3. Equation: c = 10h + 3. (Answer D)