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xxMikexx [17]
3 years ago
12

A study of 420,090 cell phone users found that 135 of them developed cancer of the brain or nervous system. Prior to the study o

f cell phone use, the right of such cancer was found to be 0.0203% for those not using cell phones. A. Use The sample data to construct a 90% confidence interval estimate of the percentage of cell phone users who develop cancer of the brain or nervous system.
Mathematics
1 answer:
Pepsi [2]3 years ago
7 0
I have no clue I would help but have know clue
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HELP PLEASE
Maurinko [17]
\bf \cfrac{x^2-x-42}{x-6}\implies \cfrac{(x+7)\underline{(x-6)}}{\underline{x-6}}\implies x+7

so.. the left-hand-side does indeed simplify to x+7, so the equation does check out.

however, notice something, for the equation of x+7, when x = 6, we get (6) + 7 which is 13.

BUT for the rational, we get    \bf \cfrac{x^2-x-42}{x-6}\qquad \boxed{x=6}\implies \cfrac{x^2-x-42}{\boxed{6}-6}\implies \stackrel{und efined}{\cfrac{x^2-x-42}{0}}

so, even though the siimplification is correct, the rational or original expression is constrained in its domain.
6 0
3 years ago
Express the ratio as a fraction in simplest form 18 oz to 3 cups
valentinak56 [21]

Answer:

6/1

Step-by-step explanation:

Both 18 and 3 can be divided by 3

18 divided by 3 = 6

3 divided by 3 = 1

So the ratio is 6 : 1

So the fraction is 6/1

3 0
3 years ago
Read 2 more answers
7 watermelons cost $8.96.Which equation would help determine the cost of the 5 watermelons? Into two fractions with a expontnet
mestny [16]

Answer:

hola CTM

Step-by-step explanation:

4 0
3 years ago
Factor completely. 25w² + 60w + 36 Express the answer in the form (aw+b) 2 .  
Lana71 [14]
<span>25w² + 60w + 36
= (5w + 6)^2

hope it helps</span>
6 0
3 years ago
4k+mn=n-3; solve for n
solong [7]
Since we are solving for n you have to isolate the n. Therefore, you want all the variables with an n in it on one side and all the variables without an n on the other side:) :
4k+3= -mn+n (There were a change in signs because for example you moved the -3 to the other side, therefore it can only be a negative on one side so now you have to change the sign to a positive:) hope you got that)
That would've been your answer because you cannot do anything else...Hope this helped :)

8 0
3 years ago
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