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3 years ago

Use distributive property to write the expression withoit parenthesis: 3(7x+4)

Mathematics

2 answers:

zalisa [80]3 years ago

6 0

Answer:

21x + 12

Step-by-step explanation:

correct me of i am wrong

jekas [21]3 years ago

6 0

Answer:

21x+12

Step-by-step explanation:

3(7x+4)

21x+12

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Multiply by 6

IRISSAK [1]

Answer: D (1,0): (6,5); (36,10): (216,15)

Step-by-step explanation:

Because 1x6=6 0+5=5

6x6=36 5+5=10 ect.

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3 years ago

3 lines are shown. A line with points P, R, N intersects a line with points M, R, O at point R. A line extends from point R to p

attashe74 [19]

Answer:

(C)Angle MRN and Angle NRO

Step-by-step explanation:

A diagram of the given problem is drawn and attached below.

From the diagram:

Option A: Angle PRL and Angle LRM = Angle PRM which is not 180 degrees.

Option B: Angle ORP and Angle MRN are vertically opposite angles and are therefore not linear pairs.

Option C: Angle MRN and Angle NRO are on the line ORM and therefore forms a linear pair.

Therefore, the correct option is C.

5 0

3 years ago

Read 2 more answers

Teresa says that because the diagonals of a parallelogram bisect each other, if one diagonal is 4.2 cm, the other diagonal must

saw5 [17]

Answer:

See it in the pic.

Step-by-step explanation:

See it in the pic.

3 0

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] .

7 0

3 years ago

How many squares are in this figure in all?

Tanya [424]

Answer:

explanation

Step-by-step explanation:

there

are

squares

all

together

6 0

3 years ago

Read 2 more answers

Use distributive property to write the expression withoit parenthesis: 3(7x+4)​

Use distributive property to write the expression withoit parenthesis: 3(7x+4)