Sum of 2x 2 + 3x - 4, 8 - 3x, and -5x 2 + 2.

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?

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)

3/4 + p = 1/2? i’m not sure how to solve it