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How do businesses a country's economy? a. by investing in goods and services b. by increasing the unemployment rate c. by making profits

The number of fish in a lake can be modeled by the exponential regression equation y=14.08 x 2.08^x where x represents the year

In trapezoid abcd, ac is a diagonal and ∠abc≅∠acd. find ac if the lengths of the bases bc and ad are 12m and 27m respectively.