Asked by Stephon

Robyn and Shruti both run on the cross country team. Robyn runs 2 miles every day. Shruti starts her week with a 3-mile run and runs 1 mile every day, even on the day she runs the 3 miles. If M is the number of miles run during the week, and d id the number of days the girl has run this week, for which girl is the relationship between M and d multiplicative?

A. Shruti, because M = d +3
B. Shruti, because M = 3d
C. Robyn, because M = 2d
D. Robyn, because M = d + 2

Can someone show me how to solve?
Answered by Henry
Robyn: M = 2mi/day * d days = 2*d = 2d.
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