If d varies directly with t and d is 108 when t is 4, find d when t is 7.

189

Step-by-step explanation:

Given : D varies directly with t and D is 108 when t is 4

To Find:  Find D when t is 7

Solution:

D varies directly with t

D ∝ t

So,

where k is the constant of proportionality

Now we are given that D is 108 when t is 4

So,

Thus the constant of proportionality i.e. k = 27

So,

Now substitute t = 7

So,  

So, D = 189 when t = 7

7 ft 6 in means 7 1/2, because 6 in is 1/2 of a foot. 7 ft 8 in means 7 2/3 because 8 in is 2/3 of a foot. 23/3 = 7 2/3. 15/2 = 7 1/2.

23/3   *   15/2   = 57 1/2

step-by-step explanation:

really your just stupid if you don't know this

step-by-step explanation: