Can someone please simplify this? :)
9x(8 * 9y) + 4

648xy+4

Step-by-step explanation:

9x*72y + 4 = 648xy+4

in problems involving proportions, we can use cross products to test whether two ratios are equal and form a proportion. to find the cross products of a proportion, we multiply the outer terms, called the extremes, and the middle terms, called the means.

hope it