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Rearrange the formula c^2 = a^2 + b^2 for b

Twenty-five percent of the customers entering a grocery store between 5 p.m. and 7 p.m. use an express checkout. consider five randomly selected customers, and let x denote the number among the five who use the express checkout.

What happens to the area as the sliders are adjusted? what do you think the formula for the area of a triangle is divided by 2?