Answer:
The value is 
Step-by-step explanation:
From the question we are told that
The mean is 
The standard deviation is 
The safest water level is between 7.2 and 7.8
Generally the probability that the selected pool has a pH level that is not considered safe is mathematically represented as

Here

Generally 
So
=>
From the z-table the probability of (Z < -1.5) and ( Z <1.5) are

and

So
So

=> 
Answer:55 units
Step-by-step explanation:
4x-9=2x+15
2x=24
X=12
12+17+26=55 units
I believe the answer is 2.4, because 24/10= 2.4. To check this answer, multiply 10 by 2.4. :)
Answer:
Step-by-step explanation:
Next time please share the answer choices. Thanks.
Because the common factor 0.75 is less than 1 (but greater than 0), we know that this is a decaying function. As x increases, the graph approaches the x-axis (that is, the line y = 0).