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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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How do u simplify each expression by combining like terms?
Masja [62]

Answer:

1. 8y - 9y = -1y

( 8 - 9 = -1)

3. <u>8a</u> - 6 <u>+a</u> - 1

( i have showed the like terms here)

8a - 1a= 7a

-6 - 1 = -7

7a - 7

5. -x - 2 + 15x

( i have showed the like terms here)

-x + 15x = 14x

(x = 1)

14x + 2

7.<u>  8d</u> - 4 <u>- d</u> - 2

( i have showed the like terms here)

8d - d = 7d

-4 -2 = -6

7d - 6

8. 9a <u>+ 8</u> - 2a<u> - 3</u> - 5a

( i have showed the like terms here)

9a - 2a - 5a = 2a

8 - 3= 5

2a + 5

6 0
3 years ago
Solve for BC and round your answer to the nearest hundredth
Tasya [4]
You gotta round the be to 100,000
6 0
3 years ago
I don’t know how to do this. Can you help please help me ?
N76 [4]

Answer:

  • sin = -√3/2
  • cos = -1/2
  • tan = √3
  • sec = -2
  • csc = (-2/3)√3
  • cot = (√3)/3

Step-by-step explanation:

See the attached picture for a drawing of the angle and its terminal point coordinates. Those are (cos(4π/3), sin(4π/3)), so we have the following trig function values:

  sin(4π/3) = -√3/2

  cos(4π/3) = -1/2

  tan(4π/3) = sin/cos = √3

  sec(4π/3) = 1/cos = -2

  csc(4π/3) = 1/sin = -(2√3)/3

  cot(4π/3) = 1/tan = (√3)/3

_____

<em>Additional comment</em>

It helps to know that 1/√a = (√a)/a. This lets you write the ratios with a rational denominator in each case.

3 0
3 years ago
Find the value of x to the nearest tenth.
Alex73 [517]

64 - 9 = 55  \sqrt{55}  =  7.4161984871

7.4161984871/2 ≈3.7

6 0
3 years ago
Plz I need help on this question
Alina [70]

Answer:

11.33

Step-by-step explanation:

First find the markup

8.80 * 25%

8.8 *.25 = 2.20

The new price is 8.80+2.20 = 11

Now find the tax

11*.03

.33

Add the tax to the new price

11+.33

11.33

3 0
3 years ago
Read 2 more answers
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