You buy an item for $74.95, and the sales tax is 4.5%. You give the clerk four $20 bills. Figure the following amounts: -The amount of sales tax
-The total cost including tax
-The amount of change you should receive.

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Taking algebra two apex courses and need with these questions

A33 gram sample of a substance that's used to detect explosives has a k-value of 0.1473. n = noekt no = initial mass (at time t = 0) n = mass at time t k = a positive constant that depends on the substance itself and on the units used to measure time t = time, in days