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step-by-step explanation:

12475909

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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225x²+4=0

225x²=0-4

225x²=-4

x²=-4/225

x=±√-4/225

144.50

step-by-step explanation:

21.5 x 13.4=288.10 divide by 2