Answer:
20 times an hour so 20 times 48 is 960 1920-960 is 960 gallons so there is 960 gallons of water left
Answer:

Step-by-step explanation:
I don't know what level math you're taking but in lower level math this would be undefined, can't be simplified. But some higher levels simplify it with imaginary or complex number representations. So take your pick, but it's still undefined
Answer with Step-by-step explanation:
We are given that


We have to find the extreme values of the function.



Therefore,




Substitute the values in g(x)
Then, we get





When
then,

When 
Then, 


Hence, maximum value of f(x,y,z) is 23 at (2,2,1) and minimum value of f(x,y,z) is -23 at (-2,-2 ,-1).
Its 7xy/1y I understand it its pretty easy
Answer:
The test value is z = -1.31.
Step-by-step explanation:
The Eagle Ridge Contractors Association claims the average price of a home in their subdivision is $125,150.
This means that the null hypothesis is that the mean is this value, that is:

The Eagle Ridge Home Owners Association is interested in knowing if the costs of homes for sale in this subdivision are actually lower than claimed.
This means that at the alternate hypotehsis we test that the mean is lower than that value, that is:

The test statistic is:

In which X is the sample mean,
is the value tested at the null hypothesis,
is the standard deviation and n is the size of the sample.
125150 is tested at the null hypothesis:
This means that 
Standard deviation of $7,350.
This means that 
A sample of 36 homes for sale in this subdivision had an average selling price of $123,550.
This means that 
Compute the test value.



The test value is z = -1.31.