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tia_tia [17]
4 years ago
8

The Environmental Protection Agency sets limits on the maximum allowable concentration of certain chemicals in drinking water. F

or the substance PCB, the limit was set at 5 ppm (parts per million). The PCB level is unsafe if it is greater than 5 ppm. A random sample of 36 water specimens from the same well results in a mean PCB concentration of 5.2 ppm with standard deviation of 0.6 ppm. Does the data substantiate that the water is unsafe?
Mathematics
1 answer:
steposvetlana [31]4 years ago
6 0

Answer:

I need help to make a good day

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Graph the system of equations below on a piece of paper. What is the solution? TW y=x-1 y=-2x+5​
d1i1m1o1n [39]
<h2>Given↷</h2>

A system of equations

  • y= x-1
  • y= -2x+5
<h2>To find↷</h2>
  • The solution to the system of equations
<h2>Answer↷</h2>
  • (2,1)
<h2>Solution↷</h2>

y = x -1 _ _ _ _ _ _(1)

y=-2x+5_ _ _ _ _ _(2)

  • subtracting equation 2 from equation 1,

we get,

x -1 = y

-(-2x +5 = y)

__________

3x -6 = 0

3x = 6

x = 6/3

x = 2

___________

  • Plugging the value of x in equation 1,

y= 2-1

y= 1

  • hence, the solution of this system of equation is (2,1)

7 0
2 years ago
Read 2 more answers
Please help urgent!!!
Vaselesa [24]

Answer: n=8 cm

Step-by-step explanation:

You can solve this problem by applying the "Intersecting chords theorem". You must follow the proccedure below:

 1. Let's represent each length, as below:

 (P will be the point of intersection)

 AP=4 cm

 CP=6 cm

 DP=3 cm

 BP=n

 2. Therefore, you have:

 APxCP=BPxDP

 APxCP=nxDP

 3. Now, you must clear "n", as below:

 n=APxCP/DP

 4. When you substitute each value into n=APxCP/DP, you obtain:

 n=(4 cm)(6 cm)/3 cm

 n=24 cm²/3 cm

 5. Finally, the result is:

 n=8 cm

5 0
4 years ago
Read 2 more answers
Write an equivalent expression for -5(3-2x)
KatRina [158]

Answer:

-15+10x

Step-by-step explanation:

All you have to do is simplify.

-5(3-2x)

-5(3)+-5(-2x)

-15+10x

If this helps please mark as brainliest

4 0
3 years ago
Kylie opened a bank account. She deposited $76.50 into her account every month for 10 months. She used $30.50 every month to pay
babymother [125]
This question might look tough, but if we break it down, it's super easy! I'll walk you through the steps.

Firstly, we need to figure out the total amount of money she deposited over the 10 months. To figure this out, all we have to do is multiply the $76.50 per month by the 10 months.

76.50 * 10 = 765

There we have it. She deposited a total of $765 over the course of the 10 months. On to the next step.

Second, we need to figure out the total amount of money she spent over the 10 months paying for singing lessons. To do that, all we have to do is multiply the $30.50 it took for each month by the 10 months.

30.50 * 10 = 305

There it is! She spent a total of $305 on singing lessons over the 10 months. On to the next step.

Now, we must subtract the cost of the singing lessons over 10 the months by the amount she deposited over the 10 months. Since she deposited a total of $765 and she spent $305 on singing lessons, here's the equation we're doing.

765 - 305 = 305

There we go! She had a total of $305 left after the 10 months. I'll leave the last step to you, I know you can do it!

If you have trouble figuring it out, post on my profile or PM me and I'll help you. :)

- Sofie
3 0
4 years ago
Read 2 more answers
Solve the inequality 3x - 5 &lt; 4.
lbvjy [14]
<span>3x - 5 < 4.

Add 5 to both sides, 
3x < 9

Divide 3 from both sides, 
x < 3

Hope this helps!</span>
6 0
3 years ago
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