Consider the expression 5a + (-5b), where a is a negative number and a>b. Is the sun positive or negative?

According to statistics a person will devote 32 years to sleeping and watching tv. the number of years sleeping will exceed the number of years watching tv by 18. over a lifetime, how many years will the person spend on each of these activities

If the cost to mail a package is an initial $5 and $0.28 for every pound the total cost to mail a package was $11.27, how much did the package weigh?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !