Alaptop has the listed price of $523.99 before tax if the sales tax rate is 8.25% find the total cost of the laptop with sales tax included.
round your answer to the nearest cent as necessary.

Achemist has 200 ml of a 10% sucrose solution. she adds x ml of a 40% sucrose solution. the percent concentration, y, of the final mixture is given by the rational function: the chemist needs the concentration of the final mixture to be 30%. how many milliliters of the 40% solution should she add to the 10% solution to get this concentration?

Shane can shovel the driveway in 4 hours, but if his sister it would take 2 hours. how long would it take taylor to shovel the driveway alone

One integer is 5 more than another. their product is 104. find the integers