The big dog weighs d pounds the puppy weighs half the amount

Which equation results from adding the equations in this system? x+6y=9 and -x+2y=-15

For g(x) = 5x - 3 and h(x) = [tex]\sqrt{x}[/tex], find (g · h)(4)

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)