Please, please help me, Answer it correctly and properly. Thank you in advance!

Write the letters if it is a function.

goog may have it for you

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

but which class are u may know that first