The cost for n students to attend a workshop is 7n + 12 dollars. what is the cost, in dollars, for 6 students to attend

The perimeter of a movie screen is 54 meters. the screen is 18 meters wide. how tall is it?

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! )

Gables properties corp. is leasing office building with an area of 49b^2+70b+25. what is the shape of the building? a) rectangle b) square