Need finding the measure of each angle indicated.

Precalculus question, image attached.

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

If x varies directly as y, and x = 7.5 when y = 10, find x when y = 4