Verified Answer :

texaschic101

if it varies directly, then u can make a proportion.
105/3 = d/8
cross multiply
(3)(d) = (105)(8)
3d = 840
d = 840/3
d = 280 <===

D = kt 

solve for k when D= 105 and t = 3 

k = 35 

So, 

D = 35t 

when t is 8 

D = (35)(8) = 280 

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