Jonathan goes out for dinner with his family. They want to give the waiter a 20% tip. Which expression represents the total cost of the bill, including tip, if the cost of the dinner is d dollars?

Complete the standard form of the equation that represents the quadratic relationship displayed above, where a, b, and c are rational numbers.

God's gym charges a sign-up fee of $100 plus $30 per month. write an expression to represent how much someone would pay for a membership.

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! )