how many 1/2 inch cubes does it take to fill a box with a width of 1 1/2 inches, length of 3 inches. and height 4 inch

Which system of linear inequalities is represented by the graph?

Find the greatest common factor of the followig monomials 21u^5v,3u^4v^6, and 3u^2v^5

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! )