Question

The relationship between the length in feet and 1/2 inch pipe H and quarter inch pipe

Answer 1

Notice that the intersecton of both inequality is located approximately at the point (150,50). This means that there are at least 100 more feet of quarter inch pipe than half inch pipe, and since the combined cost is represented by the inequality

`3h+4q\le800`

then, it must not cost more than 800. Therefore, the correct option is a)