Archimedes drained the water in his tub. The Amount of water left in the tub (IN MINUTES) is Graphed.
HOW LONG DID IT TAKE THE WATER TO COMPLETELY DRAIN?_ Minutes.

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.

How much dextrose 70% must be mixed with dextrose 5% to prepare 1,000 ml of dextrose 20%?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?