At full price, melvin would pay 1.6791.6791.679 dollars per liter of gasoline. using his loyalty card, melvin only pays 1.4391.4391.439 dollars per liter. how much less does melvin pay per liter using his loyalty card?

Melvin paid 0.24 dollars less per liter, or 14.29% less respect to the full prices

Step-by-step explanation:

Full price: 1.679 dollars per liter

With loyalty card: 1.439 dollars per liter

So, Melvin paid 1.679 - 1.439 = 0.24 dollars less per liter. In percentage term, this represents a discount of (0.24/1.679)*100 = 14.29% respect to the full prices.

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.