Factorise: a - b + ab - 1
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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: on kudzu, being female and being green are independent events.

step-by-step explanation:

answer: x=60