Can someone do this for me ? grade check goes tonight at 12 i need to bring up my grade please

What is the solution to the system of equations? (–2, –8) (–1, –5) (0, –2) (2, 4)

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.

The marked price of an article is 25% above its selling price and the cost price is 30% less than its marked price . find the discount percent and gain percent. only a brainlest can solve it i will mark you brainlest