Answer:
1) The third option.
2) The last option.
Step-by-step explanation:
1) f(x) is greater on the interval (0,3), which is opened, because if you substitute
you obtain the following result:

2) If
, you obtain that:

Therefore: 
Answer: x=-9/2
Alternative Form: x= -4 1/2, x= -4.5
15 dollars from 1 sidewalk
140 dollars from ? sidewalks
140/15 =9.333(bar)
Dionte needs to shovel 10 sidewalks