Suppose we want to know the total cost of buying x toys and we know that each toy costs $2. The relationship between the cost and the number of toys is
C(x) = 2x
If we purchase 6 toys, the cost would be
C(6) = 2*6 = $12
This is an example where it's adequate to use a single variable (or unknown) to find the value of another variable.
Now suppose we want to know the total cost of buying x toys for $2 each and include the tax rate in the calculations.
If we know the tax rate r, we can compute the total cost as
C(X,r) = 2x*(1 + r/100)
For example, to purchase x=6 toys and the tax rate is r=8%, the total cost is:
C(6,8) = 2*6*(1 + 8/100)=$12.96
If we had tried to calculate this cost without the use of two unknowns, it would have not been possible.
Thus, the pattern to use one or two variables depends on how many factors determine the final result.
Answer:
its D just took the test
Step-by-step explanation:
Answer:
A’ is (3,-3)
B’ is (-1,-4)
C’ is (-1,2)
D’ is (3,1)
Step-by-step explanation: i forgot how i did this but i did it last week in math or somthing sorry if its wrong it was right for me
Answer:
54!
Step-by-step explanation:
300-30
=270×.20
=54
The average height is 
and 
inches if Allen is 
tall and Terrel is 
tall.
How to find the average height ?
Allen height is 
Terrel height is 
And we know that 
So Allen height is
And Terrel height is
Average of the Allen and Terrel height is
And average height in feet is 
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