(a) At Smith's Bike Rentals, it costs $18 to rent a bike for 4 hours. How many dollars does it cost per hour of bike use?

$72

Step-by-step explanation:

And the reason is because it said it costs $18 for 4 hours so each every hour you add $18

so therefore it means that 18 x 4 + 72

-362

step-by-step explanation:

(12)(4)+2(12)-34(12)+2(12)-3

  \/         \/         \/         \/

  48 +   24 -   408 + 24 - 3

      \   /               \   /

          72     -     432 - 3 = -363

if you're trying to figure out how much each ounce cost it would be 0.20

cents each ounce