Brittany rode her bicycle 4.5 miles in 30 minutes. brandon rode his bicycle 7 miles in 45 minutes. based on these rates which statement is

There may be a simpler way to do this but this worked:
Divide 4.5/30 you get 3/20
Divide 7/45 you get 7/45 (can't be simplified as a fraction)

To see which is larger, you have to find a common denominator.  There might have been another one but I just chose to multiply them together.  So you get 3/20=135/900 and 7/45=140/900 So Brittany went slower by 3/20 mile per minute.

Hope that helps.  Feel free to ask questions if that doesn't make sense.

than do 23.50 times 18 and then divide your answer by 100 than you will get x.