Find the measure of side QR

Combined megan and kelly worked 60 hours. kelly worked twice as many hours as megan. how many hours did they each worked?

The vet charges $45 for an office visit and $10 for each vaccination your dog needs. write an eaquation

Marla bought a book for $12.95, a binder for $3.49, and a backpack for $44.99. the sales tax rate is 6%. find the amount of tax and the total she paid for these items