Exploring Direct, Joint, and Inverse Variation

What type of variation involves a single variable multiplied by a constant?

In problem 16, what is the constant of variation?

Which problem demonstrates joint variation?

If y varies directly as x and y = 15 when x = 3, what is y when x = 12?

In a joint variation, if y = kxz and y = 80 when x = 5 and z = 8, what is k?

What is y when x = 16 and z = 2 in the joint variation equation y = kxz?

In an inverse variation, if y = k/x and y = 2 when x = 25, what is k?

How much meat do three Siberian tigers need for the month of January?

What type of variation is used to calculate the meat required for Siberian tigers over days?

If y varies inversely as x and y = 50/x, what is x when y = 40?