Well, I'm way past the 15 min mark, but here's how to do the question.
With this, you will need to use the distance formula,
, on XY, YZ, and ZX.
XY: 
Firstly, solve inside the parentheses: 
Next, solve the exponents: 
Next, solve the addition, and XY's distance will be √29
(The process is the same with the other 2 sides, so I'll go through them real quickly)
YZ:

ZX:

Now that we got the 3 sides, we can add them up: 
In short, your answer is 14.8, or the second option.
Answer:
1=z-9
2=9+z
3=9/z
4=9z
Step-by-step explanation:
Factor out the "x" and you'll have:
Answer:
Step-by-step explanation:
There is no solution as you have two variables and only one equation. The best you can do is solve for one variable as a function of the other.
