Marco rode 120 miles on the first day of his cross-country bicycle trip. he planned to ride an additional 100 miles each day. write an algebraic expression to represent the total number of miles he will ride after d days have passed.

100d+120
100 miles x number of days riding + the initial 120 miles

1. isolate the variable, in this case, d. subtract 35.5 on both sides of the equation.2. 52 subtracted by 35.5 is 16.53. therefore your answer would be d= 16.5this is the basics of pre algebra, isolating variable through adding, subtracting, multiplying, and dividing, if you have any other questions to ask just comment!