50 points decreased by 26% is 37, because to find the percentage, all you have to do is multiply the number you are trying to decrease the percentage of, and take the percentage as a decimal form and multiply the two. Then, you have to subtract that number from the base to get your final answer. :)
The answer is E.90
1/2 inches = 10 miles
9(1/2) inches = 4 1/2 inches
9(10) miles = 90 miles
U just move the decimal over and they would equal 3 and 0.1