3 years ago

Which of the following is a composite number? A. 13 B. 63 C. 61 D. 31

Mathematics

1 answer:

OleMash [197]3 years ago

7 0

13, 61, and 31 are prime numbers. 63 is a composite number

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Sarah was thinking of a number. Sarah halves it and gets an answer of 46.5. What was the original number?

777dan777 [17]

Answer:

Step-by-step explanation:

If she halves it she divided it by 2. So, all you have to do is reverse that procss by multiplying by 2. I hope this helps :)

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3 years ago

Read 2 more answers

The life in hours of a 75-watt light bulb is known to be normally distributed with standard deviation σ = 25 hours. A random sam

irina [24]

Answer: a) (1008.34,1019.658) b) (1009.24,1018.76)

Step-by-step explanation:

Since we have given that

n = 75

mean = 1014 hours

Standard deviation = 25 hours

At 95% two sided , z = 1.96

So, confidence interval would be

$\bar{x}\pm z\dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.96\dfrac{25}{\sqrt{75}}\\\\=1014\pm 5.658\\\\=(1014-5.658,1014+5.658)\\\\=(1008.34,1019.658)$

(b) Construct a 95% lower confidence bound on the mean life.

z = 1.65

So, confidence interval would be

$\bar{x}\pm z\times \dfrac{\sigma}{\sqrt{n}}\\\\=1014\pm 1.65\times \dfrac{25}{\sqrt{75}}\\\\=1014\pm 4.76\\\\=(1014-4.76,1014+4.76)\\\\=(1009.24,1018.76)$

Hence, a) (1008.34,1019.658) b) (1009.24,1018.76)

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4 years ago

Riding an exercise bike burns 6 calories per min how many calories will a person burn if he/she bikes for 23 1/2 minuets

Vedmedyk [2.9K]

Answer: 141

Step-by-step explanation:

23 1/2 *6=141

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3 years ago

a class has 14 students, 8 students are females, and 6 students are males. how many teams of 7 students contain at most 4 female

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Answer:

2416

Step-by-step explanation:

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3 years ago

Which of the following is a composite number?<br> OA) 23<br> OB) 11<br> OC) 25<br> OD) 19

Flauer [41]

Answer:

its 25

Step-by-step explanation:

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3 years ago