Answer: 
Step-by-step explanation:
Given
The unit cost is given by
find the derivative of the unit cost and equate it to zero to obtain the minimum value
Substitute 140 for 
in the cost function, we get
![C(140)=0.6[140]^2-168(140)+30,389\\C(140)=11,760-23,520+30,389\\C(140)=\$18,629](https://tex.z-dn.net/?f=C%28140%29%3D0.6%5B140%5D%5E2-168%28140%29%2B30%2C389%5C%5CC%28140%29%3D11%2C760-23%2C520%2B30%2C389%5C%5CC%28140%29%3D%5C%2418%2C629)
How long will it take to walk from the first floor to the eightheighth floor (at the same pace, assuming that all floors have the same height).
8080 seconds
Answer:
A
Step-by-step explanation:
Owing someone meand you have to give them money and therefore is represented ad a negative number.
-14 + (-7) is the same as -14 - 7
X = 4. As you need a number that when added to 8, will give you 12. And 4 is the only number able to do that. I don't know why you're asking this if you're in high school however.
