Can y’all please help me with this question?

(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 ?

Including 6% sales tax, an inn charges $135.68 per night. find the inns nightly cost

Heather is riding a quadratic function that represents a parabola that touches but does not cross the x-axis at x=-6