Need help asap dont be wrong show work if you can its cool if you cant

Segment xz is bisected by point y. if xy = 12x, and the measure of xz = 18x – 6, solve for x

Awater holding tank measures 105 m long, 50 m wide, and 8 m deep. traces of mercury have been found in the tank, with a concen- tration of 60 mg/l. what is the total mass of mercury in the tank? answer in units of kg.

Leslie started last week with $1200 in her checking account. during the week, she wrote the checks below.