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3 years ago

The expression equivalent to (3y+8x)+(4x-8y)

Mathematics

1 answer:

Fiesta28 [93]3 years ago

3 0

Answer:

= 12x - 5y

Step-by-step explanation:

Given that:

=(3y+8x)+(4x-8y)

Now simplify by removing brackets:

= 3y + 8x + 4x - 8y

Add the same terms:

= 12x - 5y

i hope it will help you!

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Students are son Bementary School made $305 selling 21 equally paced boxes of candy which is the best estimate to the amount eac

Nutka1998 [239]

Answer:

the best estimate for each boc cost is $15

Step-by-step explanation:

divide 305 to 21 it is near 15

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3 years ago

Find the difference 42 2/3 - 34 1/8

Valentin [98]

Answer:

8 13/24

Step-by-step explanation:

42 2/3= 42 16/24

34 1/8= 34 3/24

42 16/24- 34 3/24= 8 13/24

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4 years ago

Write an expression for "8 times z."

garri49 [273]

Answer: 8z 8(z)

Explanation: well 8 times z is simply 8(z)I don’t really think there is another way

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3 years ago

The equation Y-3=-2(x+5) is written in point-slope form. What is the y-intercept of the line?

xz_007 [3.2K]

Answer:

Step-by-step explanation:

hello :

y-3=-2(x+5)

y - intercept when : x=0 : y-3 =-2(0+5)

y-3 =-10

y = - 7

7 0

3 years ago

Read 2 more answers

The National Center for Education Statistics surveyed a random sample of 4400 college graduates about the lengths of time requir

Paha777 [63]

Answer:

95% confidence interval for the mean time required to earn a bachelor’s degree by all college students is [5.10 years , 5.20 years].

Step-by-step explanation:

We are given that the National Center for Education Statistics surveyed a random sample of 4400 college graduates about the lengths of time required to earn their bachelor’s degrees. The mean was 5.15 years and the standard deviation was 1.68 years respectively.

Firstly, the pivotal quantity for 95% confidence interval for the population mean is given by;

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

where, $\bar X$ = sample mean time = 5.15 years

$\sigma$ = sample standard deviation = 1.68 years

n = sample of college graduates = 4400

$\mu$ = population mean time

Here for constructing 95% confidence interval we have used One-sample z test statistics although we are given sample standard deviation because the sample size is very large so at large sample values t distribution also follows normal.

So, 95% confidence interval for the population mean, $\mu$ is ;

P(-1.96 < N(0,1) < 1.96) = 0.95 {As the critical value of z at 2.5%

level of significance are -1.96 & 1.96}

P(-1.96 < $\frac{\bar X-\mu}{\frac{\sigma}{\sqrt{n} } }$ < 1.96) = 0.95

P( $-1.96 \times {\frac{\sigma}{\sqrt{n} } }$ < ${\bar X-\mu}$ < $1.96 \times {\frac{\sigma}{\sqrt{n} } }$ ) = 0.95

P( $\bar X-1.96 \times {\frac{\sigma}{\sqrt{n} } }$ < $\mu$ < $\bar X+1.96 \times {\frac{\sigma}{\sqrt{n} } }$ ) = 0.95

95% confidence interval for $\mu$ = [ $\bar X-1.96 \times {\frac{\sigma}{\sqrt{n} } }$ , $\bar X+1.96 \times {\frac{\sigma}{\sqrt{n} } }$ ]

= [ $5.15-1.96 \times {\frac{1.68}{\sqrt{4400} } }$ , $5.15+1.96 \times {\frac{1.68}{\sqrt{4400} } }$ ]

= [5.10 , 5.20]

Therefore, 95% confidence interval for the mean time required to earn a bachelor’s degree by all college students is [5.10 years , 5.20 years].

8 0

3 years ago