The perimeter of a rectangle is 42 meters. The length of the rectangle is 3 meters less than twice the width. Find the length of the rectangle. *

(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 ?

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder

Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?