Find the equation of the line through the points (21, 8) and (9, 16)

With: label the vertices and all the elements needed. find x

Lola says these two expressions have the same value. expression a expression b which explains whether lola is correct?

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! )