What is 12 thousandth in scientific notation?

Answers

Answer 1

Answer: The number 0.012 can be equal to 1.2 × 10⁻².

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What is the coefficient of the term 9y in the expression 5+9y

Answers

The answer is 9.......

the coefficient would be 9

18 divided by x = -2 what is the x equal to?

Answers

18/x=-2
isolate x by multiply both sides by x:
18=-2x
divide by -2
-9=x

the environmental protection agency has determined that safe drinking water should contain no more than 1.3 milligrams per liter (mg/l) of copper, on average. to test water from a new source, you collect water in small bottles at each of 30 randomly selected locations. the mean copper content of your bottles is 1.36 mg/l and the standard deviation is 0.18 mg/l. you perform a test of

Answers

The EPA has set the safe drinking water limit for copper at 1.3 milligrams per liter (mg/L). In your sample, the mean copper content is 1.36 mg/L with a standard deviation of 0.18 mg/L from 30 randomly selected locations.

To determine if the new water source meets the EPA's standard, you should perform a hypothesis test using the provided sample data. The null hypothesis (H0) would be that the mean copper content is less than or equal to 1.3 mg/L, while the alternative hypothesis (H1) is that the mean copper content is greater than 1.3 mg/L.

With the given sample size, mean, and standard deviation, you can calculate the test statistic and compare it to a critical value to determine whether to accept or reject the null hypothesis. If the test statistic is greater than the critical value, you would reject the null hypothesis and conclude that the mean copper content of the new water source exceeds the EPA's safe limit.

It's important to remember that statistical tests can only provide evidence for or against a hypothesis, but cannot definitively prove that the new water source is safe or unsafe. Additional testing and monitoring would be necessary to make a well-informed decision about the safety of the water source.

To learn more about null hypothesis : brainly.com/question/28920252

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What is the square 16/15 in simplest radical form?

Answers

Answer:

To start off, this fraction needs to be rationalized; you can't have a radical in the denominator. So, you multiply both the numerator & denominator by the same number (so as to not mess up the proportion of numerator:denominator; it's like multiplying by 1) & get the radical out of the denominator. What number would that be? sqrt5.

So we have (sqrt6/sqrt5)•(sqrt5/sqrt5).

To simplify that, we get (sqrt6•sqrt5)/(sqrt5•sqrt5).

This can be rewritten as:

sqrt(6•5)/sqrt(5•5)

= sqrt30/sqrt25

Now, sqrt25 = 5, so that problem is solved as such:

sqrt30/5

I'm thinking sqrt30 can't be simplified any further. If it can, do so.

Hope this helps!

Step-by-step explanation:

Convert the following to a fraction:

0.363636

Answers

0.363636 = 90909
250000
as a fraction
To convert the decimal 0.363636 to a fraction, just follow these steps:
Step 1: Write down the number as a fraction of one:
0.363636 = 0.363636
1
Step 2: Multiply both top and bottom by 10 for every number after the decimal point:
As we have 6 numbers after the decimal point, we multiply both numerator and denominator by 1000000. So,
0.363636
1
= (0.363636 × 1000000)
(1 × 1000000)
= 363636
1000000
.
Step 3: Simplify (or reduce) the above fraction by dividing both numerator and denominator by the GCD (Greatest Common Divisor) between them. In this case, GCD(363636,1000000) = 4. So,
(363636÷4)
(1000000÷4)
= 90909
250000
when reduced to the simplest form.

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Hope it works!

David rowed a boat upstream for three miles and then returned to point he started from. The entire journey took four hours.
The speed of the stream is one mile per hour.
Find David's speed in still water.
David's speed in still water is ? miles per hour?

Answers

The speed of the stream: v s = 1 mph
v - David`s speed in still water
( v - 1 ) t 1 = 3
( v + 1 ) t 2 = 3
t 1 + t 2 = 4
---------------------------
t 2 = 4 - t 1
3 = ( v - 1 ) * t 1
3 = ( v + 1 ) * ( 4 - t 1 )
-----------------------------
3 = v t 1 - t 1
+
3 = 4 v - v t 1 + 4 - t 1
------------------------------
6 = 4 v + 4 - 2 t 1
2 = 4 v - 2 t 1
2 t 1 = 4 v - 2 / : 2 ( divide both sides of equation by 2)
t 1 = 2 v - 1
t 2 = 5 - 2 v
------------------
3 = ( v - 1 ) * ( 2 v - 1 )
3 = 2 v² - 3 v + 1
2 v² - 3 v - 2 = 0
v 1/2 = 3+/- √(9 + 16 ) / 4 = (3 + 5)/4 = 8/4 = 2 ( other solution is negative )
Answer: David`s speed in still water is 2 miles per hour.

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