I need help... if possible can you explain/teach me how to do this I have a few more problems like this and don't quite understand what I am doing and I have a test on monday.

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?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?

How to use order of operation in 20 divide by 4 multiply 5 = 1