Oliver earns $50 per day plus $7.50 for each package he delivers . if his paycheck for the first day was $140, how many packages did he deliver that day ?

12

Step-by-step explanation

If Oliver already earned $50 than that would be deducted from the 140,leaving you with $90 left. So divide that by the 7.50 and he delivered 12 packages that day

12

Step-by-step explanation:

140-50/7.50=12

the height of the surface increases from the center out to the sides of the road.

step-by-step explanation:

as we move out we move away from the x-axis.

and as mentioned in the problem statement that height of a road increases when we move away from the center x.

hence proved that 3rd option

the height of the surface increases from the center out to the sides of the road.

is the correct option.