Which equation can be used to represent, three minus the difference of a number and one equals one-half of the difference of three times the same number and four?

(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 ?

For what values of x is x2 + 2x = 24 true?

If the scale factor between two circles is 2x/5y what is the ratio of their areas?