To find the sales tax on an item, ​divide​ the price of the item by 20. a. Write an algebraic expression to find the sales tax on an item that costs ​d ​dollars.

b. Use your expression to find the sales tax on a television that costs $800.
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The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

Afactory makes propeller drive shafts for ships. a quality assurance engineer at the factory needs to estimate the true mean length of the shafts. she randomly selects four drive shafts made at the factory, measures their lengths, and finds their sample mean to be 1000 mm. the lengths are known to follow a normal distribution whose standard deviation is 2 mm. calculate a 95% confidence interval for the true mean length of the shafts. input your answers for the margin of error, lower bound, and upper bound.

Suppose y varies directly with x. write a direct variation equation that relates x and y. then find the value of y when x=12 y=7 when x=3