Aboy found a bicycle lock for which the combination was unknown. the correct combination is a four-digit number,

You paid 28.00 for 8 gallons of gasoline. how much would you pay for 15 gallons of gasoline?

This is my question~~ ( r ^ 4 - 2r ^ 3 - 23 r ^ 2 - 4r - 32)÷(r+4) ~~ i must use long division to solve it : / i was wondering if anyone world like to solve it. and if so, share step-by-step explanations! you! ❤

Collin did the work to see if 10 is a solution to the equation r/4=2.4