Answer:
z= 40
y=140
x= 115
Step-by-step explanation:
look at the pics
15c
The team has fifteen members and each member sells an unknown amount of coupon books.
Answer: ![(-\infty, -4]](https://tex.z-dn.net/?f=%28-%5Cinfty%2C%20-4%5D)
Curved parenthesis at negative infinity
Square bracket at -4
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Work Shown:

The last inequality shown above is the same as saying 
Converting this to interval notation leads to the final answer of ![(-\infty , -4]](https://tex.z-dn.net/?f=%28-%5Cinfty%20%2C%20-4%5D)
Note the use of a square bracket at -4 to include this endpoint. We can never include either infinity, so we always use a parenthesis for either infinity.
Retail price is the price an item is selling for in store so I would say yes unless its on sale.
f(x) = 2x
f(x) = 2x + 4 (Is translated 4 units up.)