Find the height of a parallelogram with base 6.75 and an area of 218.7 square metrrd

275/20 simplified (lmbo it told me to add more characters)

(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 ?

3x + 4y = 5 x- 3y = -7 solve by substitution