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vivado [14]
3 years ago
9

HELP ASAP! PLS!! The Water Department checks the city water supply on a regular basis for

Mathematics
2 answers:
aleksandr82 [10.1K]3 years ago
8 0

Answer:

B. 95% confident the average concentration of PCBs in the water supply is between 2.9 ppb and 3.5 ppb

Step-by-step explanation:

You are given the total number of samples, the concentration of lead, and the standard deviation. The standard deviation represents how inaccurate the estimation of the concentration of lead in the drinking water. This means that there can only possibly be a 0.3 ppb error in the estimation. 3.2-0.3=2.9, and 3.2+0.3=3.5

Mazyrski [523]3 years ago
7 0

Answer:

99.7% confident the average concentration of PCBs in the water supply is between 2.3 parts per billion and 4.1 parts per billion.

Step-by-step explanation:

Just took the question, this is the correct answer.

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I really don’t get this how do I do this:(?
Crazy boy [7]

Answer:

You are drawing a right triangle. So draw the two lines off of the right angle. Then write 5 along one line. That line is now BC, so you can start naming points and putting in lengths. Then, draw the hypotenuse (AB) going from the end of the line you were writing next to, to the other line. Make sure it is at least twice as long, because it is 13 long. Then, to find the length of the last line,  square 13, and subtract 25 from it. Take that number and find it's square root. You should get 12, which is your answer.

Step-by-step explanation:

4 0
4 years ago
Could someone help me with this?
natulia [17]
Distributive property was the first property used in STEP 1, where -4 was distributed to -3x+ 2 resulting in the equation in STEP 1. Next in STEP 2, commutative property of addition no matter how 12x and 6x are arranged, when you add them together the result will be the same. 
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For Steps 3 and 4, you will see that the addition property of equality was used in STEP 3. To keep the equation equal, you will add the same number on both sides.

STEP 4 uses Division property of Equality. Like Step 3, to keep both sides of the equation equal, you must divide both sides with the same number. It keeps the statement true by doing so. 

STEP 4 and 5 uses transitive property if you examine both as a whole. 
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If   18/18 (a) = 1 (b),  and x (c) = 18/18(a)  then, x (c) = 1 (b). 
5 0
3 years ago
5.2 x 10^-3 ____ 5.2 x 10^-6
soldi70 [24.7K]
>
hope this answers ur question!!
6 0
3 years ago
Pleaseee Solve x? - 8x = 20 by completing the square. Which is the solution set of the equation?
gavmur [86]
The correct answer is A. -22,14
3 0
4 years ago
Guys I need help on this question on my assignment. Could one of you please help me? BRAINIEST if correct.
Aleksandr [31]

Answer:

32

Step-by-step explanation:

7 0
3 years ago
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