7.06

The time it takes to mow the lawn at a large park m(x) varies inversely with the number of workers assigned to the job x. It takes 90 minutes to complete the job when 3 workers are assigned to it. Which equation can be used to find the time to complete the job when x workers are assigned to it?

m(x)=270/x

The amount of sales of single scoop ice-cream cones during the summer s(c) varies directly with the number of customers c. Twelve customers bought a total of $54 worth of ice-cream cones. Which equation can be used to find the ice-cream sales for c customers?

s(c)=4.5c

Which point is on the graph of a direct variation equation in which k = 12.4?

(4, 49.6)

Suppose that g(x) varies inversely with x and g(x)=0.2 when x = 0.1.What is g(x) when x = 1.6?

0.0125

Suppose that b(x) varies directly with x and b(x)=4325 when x = 25.What is b(x) when x = 19?

3287