Answer: 
Step-by-step explanation:
Since, According to the question,
The leak in a water tank causes the water level to decrease by 
millimeter
That is , in 1 second it decreases mm
⇒ In 
seconds it will decrease 
mm
⇒ In seconds it will decrease 
mm
It will take 20 years for the shrub to reach a height of 7 feet.
When triangles are similar, ratios of corresponding side lengths are the same. The side lengths you know are CD, DU, VW, WU. (You also know CU, but you do not know the corresponding length VU.)
The ratios can be formed in any convenient way, but it is already clear that the triangles are not similar. CD = 73 is a prime number, and neither DU nor VW is a multiple of that. For example, ...
... CD/VW = 73/84 ≠ 48/55 = DU/WU
Answer: 889.76 please tell me if im wrong
You'd want to use a vertical line test.
1st image: Every vertical line cuts the graph at at most one point
2nd image: The vertical line x = 1 cuts the graph at more than one point
3rd image: The vertical line x = 1 cuts the graph at 2 points
4th image: The vertical line x = -2 cuts the graph at 2 points
Hence, graph 1 (1st image) is a function.
