I dont know the answer to this equation

(a) calculate the molarity of a solution that contains 0.0345 mol nh4cl in 400 ml of solution. (b) how many moles of hno3 are present in 35.0 ml of a 2.20 m solution of nitric acid? (c) how many milliliters of 1.50 m koh solution are needed to supply 0.125 mil of koh ?

20 points + brainliest answer + my mom’s chocolate chip cookie ! subtract.

What is the solution to the system of equations? y=1.5-3 y=-x