Help plz I really don’t understand

The square it is supposed to be it squared 7 times 7 equals 49. The 10 is 10 times 10 which would equal 100. And the last one is just add 90 to 10.

Step-by-step explanation:

4x and 6y

im not sure though

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