SOLUTION: The cost​ C, in​ dollars, to fill a sandbox varies directly as the depth​ S, in​ inches, of the sand. The director of Creekside Daycare checks at her local

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Question 1100788: The cost​ C, in​ dollars, to fill a sandbox varies directly as the depth​ S, in​ inches, of the sand. The director of Creekside Daycare checks at her local hardware store and finds that it would cost ​$31.50 to fill the​ daycare's box with 3 in. of sand. She decides to fill the sandbox to a depth of 10 in.
​a) Find an equation of variation.
​b) How much will the sand​ cost?
Answer by Boreal(15235) About Me  (Show Source):
You can put this solution on YOUR website!
31.50=k*3; C=k*S
k=31.50/3=10.50
use this is the second equation.
C=10.50*10=$105.