1. A car travels a distance of d km in t hours. the formula that relates d to t is d=kt. What kin of varation is it?
a.direct. c.joint
b.inverse d.combined

2. the weight of a rectangular blick of metal (W) varies jointly as its length (I) width (W) and thickness (T). if the weight of a 2 dm by 3 dm by 4 dm block of aluminun is 18kg, find the weight of 16 dm by 10dm by 4dm blick aluminun.
a.408 kg B.480 c.804 d.900

3.z varies jointly as x and y. If z=16 when x=4 and y=6, find the constant of variation of the relation.
a.2/3 b.3/2 c.2 d. 3

4. if y varies inversely as x and y =10 when x=2, find y when x= 10.
A. 2 B.10 C.12 D.20


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