According to-one-mathematical-model, the-average life-expectancy-for American-men-born-in-1900-was-551 years. Life-expectancy-has-increased-by-about-0.2-year-for-each birth-year-after-1900.-If-this-trend-continues,for-which-birth9 year will-the-average-life-expectancy-be-73-years?1 a)-Write-an-equation-to-model-the-problem.-Let-t-represent the-number-of-years-after-1900.-For-example, t= 12-would-represent the-year-1912.1 Answer: t-.02x+?1 b)-Solve-the-equation,-then-answer-the-question-given-above.1 (Note: You-are-asked-for-a-year, not-a value-for-t.1 Answer: 19901

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A linear function can just be a constant, or it can be the constant multiplied with the variable like x or y. If the variables are of the form, x2, x1/2 or y2 it is not linear. The exponent over the variables should always be 1.