Answer:
x = 15 units
Step-by-step explanation:
Here, base of triangle = x units & height = 19 units

Mount everest (Himalayas) and mount elbert (rocky mountains)
Answer:
I think it may be C? I used desmos to graph it but I'm not 100%
Answer:
Option D.
3 equations with 3 variables
Step-by-step explanation:
The coordinates of a point in space must necessarily have 3 components. One to describe the distance on the x axis, another to describe the distance on the y axis to the point, and a third to describe the distance on the z axis.
If we have three variables, then 3 equations are needed to solve the system. With less than 3 equations it would be impossible to solver the system.
Therefore the correct answer is option D.
3 equations with 3 variables
Say your test is out of 100 and you 75 correct to calculate your percent you would go
75/100*100
/ = Divide
* = Times