Line ab contains points a(4, 5) and b(9, 7). what is the slope of ?

Carlos spent 1 1/4 hours doing his math homework he spent 1/4 of his time practicing his multiplication facts how many hours to carlos been practicing his multiplication facts

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

Money off coupons have been circulated to 300 households. only 2/5 of these were redeemed (used) in the local supermarket to get a free shampoo. what fraction of coupons were unused? (ps: write how you got the answer)