Answer:
see explanation
Step-by-step explanation:
Given
(x - 2)² + 9 = 0 ( subtract 9 from both sides )
(x - 2)² = - 9 ( take the square root of both sides )
x - 2 = ±
yields no real solutions
There is no real number when multiplied by itself gives - 9
In fact the solutions to
are said to be imaginary, that is ± 3i
where i = 
If interested investigate further.
8 (3)-10
24-10=14
Hope this helped :)
OK. I did it, and I have the solution.
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The length of the deck is (5 + 2x) .
The width of the deck is (4 + 2x) .
If the deck didn't have that big hole in the middle where the pool is,
then its area would be
(5 + 2x) · (4 + 2x) .
When you multiply that all out, you get Area = 4x² + 18x + 20
and the question tells us that the area of the whole big rectangle is 90 yds² .
So we can write
4x² + 18x + 20 = 90 .
Subtract 90 from each side: 4x² + 18x - 70 = 0
Divide each side by 2 : 2x² + 9x - 35 = 0
You can use the quadratic equation to solve that and find out that
x = 2.5 yards, and that's what the question is asking you.
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That makes the deck 10 yds high and 9 yds wide.
Total area of the whole big rectangle, (deck + pool ), = 90 yds².
Spending money on a game
Giving money to charity
Buying food at a supermarket
Lending money to a friend
Answer:
The answer is below
Step-by-step explanation:
The standard deviation formula is as follows:

where sum means "sum of", x is a value of a data set, m is the mean of the data set, and N is the number of data.
The standard deviation formula may seem confusing, but it will make sense after we break it down. In subsequent sections we will explain an interactive example, step by step. Here's a quick preview of the steps we're about to follow:
Step 1: Calculate the mean with the data from the graph.
Step 2: Calculate the square of the subtraction between the mean and each data (that is, each x).
Step 3: add the values that resulted from step 2.
Step 4: divide by the number of data.
Step 5: take out the square root.
And in this way you can obtain the standard deviation