Question

Evaluate for each expression m = 2/5 and n = 1/2

1) 2m + n

2) 2m - n

Please explain so I can understand the rest of the questions.

Answer 1

2m + n

(2 * 2/5) + 1/2 = 4/5 + 1/2
4/5 + 1/2 = 8/10 + 5/10 = 13/10 = 1 3/10

I'll be glad to check your work for the second problem.

Answer 2

Replace the m's with 2/5 and the n's with 1/2

2 multiplied times 2/5 + 1/2
2/1 times 2/5 = 4/5
4/5 + 1/2 you need a common denominator of 10 to finish the problem

8/10 + 5/10 = 13/10 or 1 3/10

Do the same thing for #2, but you will be subtracting 5/10 from 8/10

Answer 3

1. 2(2/5) + 1/2 = 4/5 + 1/2 = .8 + .5 = 1.3 = 1 3/10

2. Using the information above, you should be able to do this one yourself.