Simplify the expression 2i+(-4-2i)

During a bike challenge riders have to collect various colored ribbons each 1/2 mile they collect a red ribbon each eighth mile they collect a green ribbon and each quarter mile they collect a blue ribbion wich colors of ribion will be collected at the 3/4 markrer

4+(2+x) can you me solve this problem

How can writing phrases as algebraic expressions you solve problems?