You earned $15 on Monday and will earn more money tomorrow., where d is the money you earn tomorrow, represents your total earnings for the two days.

The total earnings for the two days is (15+d) dollars

Step-by-step explanation:

The total earning for the two days can be expressed as;

C=M+T

where;

C=total earnings for the two days

M=total earnings on Monday

T=total earnings on Tuesday

In our case;

M=$15

T=d

replacing;

C = (15+d)

The total earnings for the two days is (15+d) dollars