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KIM [24]
3 years ago
15

If a = 7, what is the value of the expression 2(a + 8)?

Mathematics
2 answers:
viktelen [127]3 years ago
8 0

Answer:

2(a + 8) \\ if \: a = 7 \\ 2 \times (7 + 8) \\ 2 \times 15 \\  = 30 \\

please mark as brainliest

Natali [406]3 years ago
7 0
Answer
2 x (7+8)
2x7=14
2x8=16
14+16=30
Explanation
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HELP PLEASE!<br> a + 2 2/5 = 4 3/10
amm1812

Answer:

0

Step-by-step explanation:

4 + 0 = 0

7 0
2 years ago
You borrow $2,000 for a period of 4 years you are charged simple interest at a rate of 3% how much will you repay at the end of
Aleks [24]
At the end of 4 years you will pay a extra 240 dollars 
8 0
3 years ago
A mile is equal to 5280 feet.if the highway department places a reflector every 25 feet how many reflectors will there be in 1 m
murzikaleks [220]
5280/25, ignoring the remainder, equals 211. That's the answer
8 0
2 years ago
Read 2 more answers
2. Suppose that you are looking for a student at your college who lives within five miles of you. You know that 55% of the 25,00
svlad2 [7]

Using the binomial distribution, it is found that:

a) There is a 0.0501 = 5.01% probability that you need to contact four people.

b) You expect to contact 1.82 students until you find one who lives within five miles of you.

c) The standard deviation is of 1.22 students.

d) There is a 0.3369 = 33.69% probability that 3 of them live within five miles of you.

e) It is expected that 2.75 students live within five miles of you.

For each student, there are only two possible outcomes. Either they live within 5 miles of you, or they do not. The probability of a student living within 5 miles of you is independent of any other student, which means that the binomial distribution is used to solve this question.

Binomial probability distribution

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

C_{n,x} = \frac{n!}{x!(n-x)!}

The parameters are:

  • x is the number of successes.
  • n is the number of trials.
  • p is the probability of a success on a single trial.

In this problem:

  • 55% of the students live within five miles of you, thus p = 0.55.

Item a:

This probability is P(X = 0) when n = 3(none of the first three living within five miles of you) multiplied by 0.55(the fourth does live within five miles), hence:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 0) = C_{3,0}.(0.55)^{0}.(0.45)^{3} = 0.091125

p = 0.091125(0.55) = 0.0501

0.0501 = 5.01% probability that you need to contact four people.

Item b:

The expected number of trials in the binomial distribution until q successes is given by:

E = \frac{q}{p}

In this problem, p = 0.55, and 1 trial, thus q = 1, hence:

E = \frac{1}{0.55} = 1.82

You expect to contact 1.82 students until you find one who lives within five miles of you.

Item c:

The standard deviation of the number of trials until q successes are found is given by:

S = \frac{\sqrt{q(1 - p)}}{p}

Hence, since q = 1, p = 0.55:

S = \frac{\sqrt{0.45}}{0.55} = 1.22

The standard deviation is of 1.22 students.

Item d:

This probability is P(X = 3) when n = 5, hence:

P(X = x) = C_{n,x}.p^{x}.(1-p)^{n-x}

P(X = 3) = C_{5,3}.(0.55)^{3}.(0.45)^{2} = 0.3369

There is a 0.3369 = 33.69% probability that 3 of them live within five miles of you.

Item e:

The expected value of the binomial distribution is:

E(X) = np

Hence, since n = 5, p = 0.55:

E(X) = 5(0.55) = 2,75

It is expected that 2.75 students live within five miles of you.

A similar problem is given at brainly.com/question/25343741

7 0
3 years ago
52.25 is ___% of 1,1050.00
USPshnik [31]

Answer: 0.4729%

Step-by-step explanation:

The formula to find the percent of a part in total amount :-

\%=\dfrac{\text{Part}}{\text{Total}}\times100

Given : Total amount = 1,1050.00

Part of total amount = 52.25

Now, substitute all the values in the formula , we get

\%=\dfrac{52.25}{11050}\times100\\\\\Rightarrow\ \%=\dfrac{5225}{1105000}\times100=\dfrac{5225}{11050}=0.472850678733\approx0.4729\%

Hence, 52.25 is <u>0.4729</u>% of 1,1050.00.

3 0
3 years ago
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