Answer: 9x
Step-by-step explanation:
When adding X you simply add the numbers in front of X.
3+3+3=9 so you have 9x
think of it as this. If you have 3 apples and add 3apples and then 3 more appls. How many apples are there
3 apples+ 3 apples+ 3 apples= 9 apples
Answer:
what sentence
Step-by-step explanation:
Answer:
Is that the whole Question??
Step-by-step explanation:
Answer:
83,491.67 dollars
Step-by-step explanation:
Given that a certain electronics manufacturer ound that the average cost C C to produce x DVD/Blu- ray players can be found using the equation 
To find the minimum average cost per machine we can use derivative test.
we find first and second derivative.
If for a particular value of x first derivative is 0 and second derivative is positive, then that x satisfies the minimum cost criteria.

Second derivative is always positive
I derivative =0 gives

For 83 players the cost would be minimum
Minimum cost = 
Answer:
18≤ 2.50x
because there is only so much money she is allowed to spend has to be less than or equal to 18