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3 years ago

[NEED HELP]

Mathematics

2 answers:

Alinara [238K]3 years ago

3 0

Answer:

1. vertical-line test

2.y=x

3.x

4.domain

Step-by-step explanation:

I just did it on edg and it’s right.

ExtremeBDS [4]3 years ago

3 0

Answer:

1. vertical-line test

2.y=x

3.x

4.domain

Step-by-step explanation:

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What is the value of the expression |a + b| + |c| when a = –5, b = 8, and c = –13?

Semmy [17]

For the first problem, your answer is D, 16, because -5+8=3, and 3+ |-13|=16, because the absolute value of -13=13
for the 2nd, B is the correct answer. -4.37 is smaller than -1.63,
the 3rd one is C, 19. -14+19=5,
the 4th one the answer is D, -20.1 because 12.7+ -20.1=-7.4
1=D
2=B
3=C
4=D

5 0

3 years ago

A bag contains 17 counters all of different colours. Colin chooses one counter and gives it to Obi, and another counter and give

kolbaska11 [484]

Answer:

Colin can do this is 272 ways.

Step-by-step explanation:

The first counter goes to Obi and the second to Zeema, so the order is important. This means that we use the permutations formula to solve this question.

Permutations formula:

The number of possible permutations of x elements from a set of n elements is given by the following formula:

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

In this question:

Two counters from a set of 17. So

$P_{(17,2)} = \frac{17!}{(17-2)!} = 272$

Colin can do this is 272 ways.

7 0

3 years ago

Fiona was thinking of a number. Fiona doubles it and adds 5.1 to get an answer of 11.5. Form an equation with x? Whats the answe

saveliy_v [14]

Answer:

3.2

Step-by-step explanation:

11.5 - 5.1 = 6.4

6.4 ÷ 2 = 3.2

4 0

3 years ago

Can somebody work out y/7=22

Alika [10]

Sure. So we can first identify our problem- there's a denominator. There's a simple fix, multiply both sides by the denominator to clear it. That leaves us with 7 = 22*7. y = 154.

7 0

3 years ago

Read 2 more answers

3. Suppose the local Best Buy store averages 301 customers every day entering the facility with a standard deviation of 80 custo

stich3 [128]

Answer:

The probability that the average number of customers in the sample is between 290 and 310 is 0.61922.

Step-by-step explanation:

We are given that the local Best Buy store averages 301 customers every day entering the facility with a standard deviation of 80 customers.

A random sample of 50 business days was selected.

Let $\bar X$ = sample average number of customers

The z-score probability distribution for sample average is given by;

Z = $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ ~ N(0,1)

where, $\mu$ = population average = 301 customers

$\sigma$ = population standard deviation = 80 customers

n = sample of business days = 50

The Z-score measures how many standard deviations the measure is away from the mean. After finding the Z-score, we look at the z-score table and find the p-value (area) associated with this z-score. This p-value is the probability that the value of the measure is smaller than X, that is, the percentile of X.

(a) Probability the average number of customers in the sample is between 290 and 310 is given by = P(290 < $\bar X$ < 310) = P( $\bar X$ < 310) - P( $\bar X$ $\leq$ 290)

P( $\bar X$ < 310) = P( $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ < $\frac{310-301}{\frac{80}{\sqrt{50} } }$ ) = P(Z < 0.79) = 0.78524

P( $\bar X$ $\leq$ 290) = P( $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ $\leq$ $\frac{290-301}{\frac{80}{\sqrt{50} } }$ ) = P(Z $\leq$ -0.97) = 1 - P(Z < 0.97)

= 1 - 0.83398 = 0.16602

{Now, in the z table the P(Z $\leq$ x) or P(Z < x) is given. So, the above probability is calculated by looking at the value of x = 0.79 and x = 0.97 in the z table which has an area of 0.78524 and 0.83398 respectively.}

Therefore, P(290 < $\bar X$ < 310) = 0.78524 - 0.16602 = 0.61922

Hence, the probability that the average number of customers in the sample is between 290 and 310 is 0.61922.

4 0

3 years ago