we know that
A relationship between two variables, x, and y, represent a direct variation if it can be expressed in the form 
or 
where
k is the constant of variation
in this problem we have
the point 
so
substitute
therefore
<u>the answer is</u>
<span>Krystal's rate = 1 floor in 16 min. = 1/16 floors per min.
Working together their rate = 1 floor in 5.76 min. = 1/5.76 floors per min.
We need to determine Perry's rate, so we need to equate their combined rate with the sum of the individual rates.
Let Perry's time = x
In equation form, we can write:
1/16 + 1/x = 1/5.76
Solve for x:
(x+16)/16x = 1/5.76 -> 5.76(x+16) = 16x -> 10.24x = 92.16 -> x = 9
So, Perry would take 9 mins. to do the floor alone.
I hope this helped!
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14*15 is 210 which his the entire area. now divide 210/20 you get 10.5 so you will need at least 11 bags
B. Sandwich costs $7.70 and the soda costs $2.20
