Let the total cost of the item be represented by C and the price be represented by P, then given that t<span>he total cost of an item including sales tax is directly proportional to its price, thus</span>

where k is a constant.
Given that <span>the total cost of a $32 item is $33.60, thus

Therefore, the total cost on a $55 item is given by

</span>
Answer:
The slope represents the rate of change of earnings in a week for every unitary change in number of doors knocked. For Jessica's function, her earnings change by +7 units for every unit of door she knocks.
Yes. x=3 and y =9 are the solutions.
Because if you change x=3 and y =9 ,you will have
3+2* 9 =21
3+18 =21
21 =21 (true)
45 = 4X + 1X
45= 4×(9) +1×(9)
45= 36 + 9
45 = 45
OR
45= 4X + 1X
45 = 4(9) + 1(9)
45 = 36 + 9
-36= -36
9 = 9
-9 = -9
0=0
You have to evaluate the problem this way in order to figure out the number of wafers in all. Either way the answer is still 9. I replaced the variable x with 9 in order to get my answer