If mr. khan buys 15 staplers it‘ will cost him $254.85 how would you write the using function notation

Classify the following triangle check all that apply

I'm at a bookstore with $\$35$ in my pocket and a $20\%$-off coupon. what is the cost of the most expensive book i can buy with my money and the coupon? (assume that there are books of every possible price in the bookstore. it's a large bookstore! )

Since we have computer algebra systems that can solve polynomial division problems for us, why is it necessary to learn how to do these things by hand?