Which of the following addition problems could be modeled by the algebra tiles shown below? Assume that no zero pairs have been removed yet. A. (2x2+4x+5)+(−5x2+2x−3)
B. (−2x2+5x−5)+(−x2+3x+3)
C. (−x2+3x−3)+(−2x2+3x+5)
D. (−x2+8x−3)+(−2x2−2x+5)

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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