PLS HELP ASAP

(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 ?

Use the x-intercept method to find all real solutions of the equation.x^3-10x^2+27x-18=0

What unit of been sure would be appropriate for the volume of a sphere with a radius of 2 meters