. Solve the Neumann wave problem on the half-line    utt = 9uxx + e t for t > 0, x > 0 u|t=0 = 1 + x ut |t=0 = 4 − 3 cos x 3 ux|x=0 = 2 − cost

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