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2 years ago

Multiply the first expression by the second:a2 + b2 + c2 - ab - bc - ca, a + b+ c

Mathematics

2 answers:

Stels [109]2 years ago

8 0

Answer:

https://orion.math.iastate.edu/dept/links/formulas/form1.pdf

Step-by-step explanation:

Fiesta28 [93]2 years ago

8 0

Please find attached photograph for your answer

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A ferryboat makes four trips to an island each day.The ferry can hold 88 people.If the ferry is full on each trip,how many passe

olga_2 [115]

Multiplication was invented to reduce the work involved in repeated addition.

... 88 + 88 + 88 + 88 = 4×88 = 352

352 passengers are carried to the island each day.

_____

Some questions must be answered before we can give a definite answer.

1. If the same person rides twice, are they counted twice?

2. Are passengers on the return trips (from the island) counted?

3. If return trip passengers are counted, is the ferry full on those trips?

4. Does every passenger to the island return the same day?

5. Does any passenger go to the island more than once per day?

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3 years ago

Can someone please answer this question please answer it correctly and please show work please help me I need it

WINSTONCH [101]

Answer:

Step-by-step explanation:

-19-11 = -19 + (-11)

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3 years ago

Read 2 more answers

The equation A = lw is an example of an

Mrac [35]

Answer:

A=lw is a formula for the area. L is length, W is width.

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3 years ago

An automobile company wants to determine the average amount of time it takes a machine to assemble a car. A sample of 40 times y

aksik [14]

Answer:

A 98% confidence interval for the mean assembly time is [21.34, 26.49] .

Step-by-step explanation:

We are given that a sample of 40 times yielded an average time of 23.92 minutes, with a sample standard deviation of 6.72 minutes.

Firstly, the pivotal quantity for finding the confidence interval for the population mean is given by;

P.Q. = $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ ~ $t_n_-_1$

where, $\bar X$ = sample average time = 23.92 minutes

s = sample standard deviation = 6.72 minutes

n = sample of times = 40

$\mu$ = population mean assembly time

Here for constructing a 98% confidence interval we have used a One-sample t-test statistics because we don't know about population standard deviation.

So, a 98% confidence interval for the population mean, $\mu$ is;

P(-2.426 < $t_3_9$ < 2.426) = 0.98 {As the critical value of z at 1% level

of significance are -2.426 & 2.426}

P(-2.426 < $\frac{\bar X-\mu}{\frac{s}{\sqrt{n} } }$ < 2.426) = 0.98

P( $-2.426 \times {\frac{s}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $2.426 \times {\frac{s}{\sqrt{n} } }$ ) = 0.98

P( $\bar X-2.426 \times {\frac{s}{\sqrt{n} } }$ < $\mu$ < $\bar X+2.426 \times {\frac{s}{\sqrt{n} } }$ ) = 0.98

98% confidence interval for $\mu$ = [ $\bar X-2.426 \times {\frac{s}{\sqrt{n} } }$ , $\bar X+2.426 \times {\frac{s}{\sqrt{n} } }$ ]

= [ $23.92-2.426 \times {\frac{6.72}{\sqrt{40} } }$ , $23.92+2.426 \times {\frac{6.72}{\sqrt{40} } }$ ]

= [21.34, 26.49]

Therefore, a 98% confidence interval for the mean assembly time is [21.34, 26.49] .

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3 years ago

If y=5x-3, which of the following sets represents possible inputs and outpouts of the function, represented as ordered pairs?

bixtya [17]

It’s will be d I took the test

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3 years ago

Read 2 more answers

Multiply the first expression by the second:a2 + b2 + c2 - ab - bc - ca, a + b+ c​

Multiply the first expression by the second:a2 + b2 + c2 - ab - bc - ca, a + b+ c