What two numbers multiply to make -10, but add to make +9?

Answer

10 and -1

Step-by-step explanation:

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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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answer for #1 is c

answer for #2 is d

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