In the given equation you have to simply multiply 9 with 499.... i.e. 9 * 499 = 4491 In this equation multiplying 9 with 499 is using distributive property because 9 is distributing with 499 to form 4491.
0.5, you would divide 0.375 to cancel out the height and then divide 0.75 (the new volume after you divided 0.375 by the height) by 1.5 to cancel out the x
