an article can be bought from a shop by a single cash payment of $720 or by 18 monthly installments of $56. calculate the extra cost of paying installments and express this extra cost as a percentage of the cash payment.

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.

3. 8,935,200 minutes

4. 227,040 feet