Lydia wants to purchase guitar lessons. She sees a sign that gives the prices for 7 guitar lessons and 11 guitar lessons. Write a linear equation to find the total cost c for d lessons. 7 lessons == $82

11 lessons == $122

Which of the following are accepted without proof in a logical system? check all that apply.

Atriangle with all sides of equal length is a/an triangle. a. right b. scalene c. equilateral d. isosceles

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! )