Find −a2 − 3b3 + c2 + 2b3 − c2 if a = 3, b = 2, and c = −3 the numbers after the variables are exponents. so it's like -a2 is -a squared.

The water company charges a residential customer $41 for the first 3,000 gallons of water used and $1 for every 200 gallons used over 3000 gallons. if the water bill was $58 how many gallons of water were usedanswersa 3400 gallonsb 6000 gallonsc 6400 gallons d 7000 gallons