Which of these correctly evaluates the expression (c + d)(e +f)? A ce + cf + de + df B cd + ef + cd + ef C cd x ef D cd 2 2 + ce + ef

Option A

Solution,

(c+d)(e+f)

=c(e+f)+d(e+f)

=ce+cf+de+df

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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.

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(2,20) means that the 2 is 2 hours and 20 is 20$. so there both 20$ for 2 hours only the same price. like it says. so, the dunk tank and the bounce house are the same price (20$) for the same amount of time (2 hours).

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