It would be Z-9 since you are subtracting 9 from Z
The correct answer is $44.20.
If we add up all the tips, the total is $442. If we divide this by the number of days (10), then we find the mean.
442 / 10 = 44.2
Answer: x= 8\sqrt{3} over 3, x= 8 \sqrt{3} over 3
Step-by-step explanation:
Answer:

Step-by-step explanation:

Distribute 2 through the parentheses

Collect like terms

Move 16 to right hand side and change it's sign

Add the numbers: 6 and 16

Divide both sides by 2

Calculate

Hope I helped !
Best regards! :D
Yeah it is 30 cards, I believe you got it already.