Stefan sells Jin a bicycle for 158$ and a helmet for $18. The total cost for Jin is 160% of what Stefan spent originally to buy the bike and helmet. How much did Stefan spend originally? How much money did he make by selling the bicycle and helmet to Jin?

a≈380.13mi² would be your answer if the radius was 11 miles

the equation of a line is typically written as y=mx+b where m is the slope and b is the y-intercept.

in my opinion, i think that both of them aren't that hard, but if i had to choose one, i would say algebra because you have to do exponents and everything.