May I please get help on this assignment

Simplify using positive exponents only.

Solve the equation.then check your solution 8=1.88+a

Mallory has been offers two different jobs. she can baby sit for 6 hours a week and get $8.50 an hour. or she can work at the library for 14 hours a week and make $5.50 an hour. which job will allow her to save the most money after 6weeks?