Which is an example of a direct variation?

The speed r of a moving object is inversely proportional to the time t travelled is written as

A car travels a distance of d km in t hours. The formula that relates d to t is d=kt. What kind of variation is it?

a varies inversely as b and a=10 when b = 2. Find the constant variation.

What happened to T when h is doubled in the equation T=4h?

What mathematical statement describes the graph

If g varies jointly as h and i. If g = 24 when h = 3 and i = 2, find g when h = 5 and i = 3

If 3 men can do a portion of a job in 8days, how many men can do the same job in 6 days?

If r varies directly as s and inversely as the square or u, and r = 9 when s = 12 and u =2. Find r when s = 21 and u = 3.

Clark's income varies directly as the number of days that he works. If he earns P8,000 in 20 days. How much will he earn if she works in 40 days?