For what values, if any, does f(x) = 3

Danielle earns a 7.25% commission on everything she sells at the electronics store where she works. she also earns a base salary of $750 per week. what were her sales last week if her total earnings for the week were $1,076.25?

How can (square root of 25) ^2 be rewritten?

1/2+1/6-3/4 simplify the given expression leaving the answer in improper fraction form.