Answer:
$10
Step-by-step explanation:
If Erin wants 3 CD's at $10 a piece, that is $30 total. She has $20 which means you find the difference. Total needed: $30 - Money in hand: $20 = $10
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Answer:
9
Step-by-step explanation:

Answer:
4
Step-by-step explanation:
= 4 because the variable y on the numerator and the denominator can cancel out.
Answer:
y = -2.8x +69.4
Step-by-step explanation:
Let y represent units of inventory, and x represent days since the last replenishment. We are given points (x, y) = (3, 61) and (13, 33). The line through these points can be described using the 2-point form of the equation of a line:
... y -y1 = (y2-y1)/(x2 -x1)(x -x1)
Filling in the given point values, we have ...
... y -61 = (33 -61)/(13 -3)(x -3)
Simplifying and adding 61, we get ...
... y = -2.8x +69.4