Arthur has decided to start saving for a new computer. his money is currently in a piggy bank at home, modeled by the function s(x) = 85. he was told that he could do the laundry for the house and his allowance would be a(x) = 10(x − 1), where x is measured in weeks. explain to arthur how he can create a function that combines the two, and describe any simplification that can be done.