Two times john's age plus three times melissa's age equals 34. melissa's age is also five times john's age. how old is melissa?

(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 ?

It says factor each expression completely 8y+48

If rt is greater than ba, which statement must be true ?