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3 years ago

What is the value of 8(2.3+x) when x=7

2 answers:

3 0

Just substitute the value of x = 7
= 8(2.3 x)
= 8(2.3 * 7)
= 8(16.1)
= 128.8

In short, Your Final Answer would be 128.8

Hope it help

alukav5142 [94]3 years ago

3 0

Hello!

The first thing you want to do it plug in the numbers.

8(2.3+7) = 74.4

Hope this helps!

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HELP I NEED HELP ASAP

Allisa [31]

Answer:

3x^2-6x+3=0

x^2-2x+1=0

x^2-x-x+1=0

x(x-1)-(x-1)=0

(x-1)(x-1)=0

x=1,1

so x has only one answer

so it intersects only one time

5 0

3 years ago

Radius OB measures x units. Which expression represents

777dan777 [17]

Answer:

Circumference of the smaller circle = 2.1x units

Step-by-step explanation:

Given question is incomplete; here is the complete question.

Two similar circles are shown. The circumference of the larger circle, with radius OB, is 3 times the circumference of the smaller circle, with radius OA. Radius OB measures x units. Which expression represents the circumference of the smaller circle with radius OA ?

Radius of the larger circle OB = x units

Radius of the smaller circle OA = y units

Circumference of larger circle = 2πx units

Circumference of smaller circle = 2πy units

Since circumference of larger circle is 3 times the circumference of smaller circle,

2πx = 3(2πy)

2πx = 6πy

x = 3y

y = $\frac{x}{3}$

Therefore, circumference of the smaller circle = $2\pi (\frac{x}{3})$ units

= $\frac{2\pi x}{3}$ units

= 2.094x

≈ 2.1x

Circumference of the smaller circle circle = 2.1x units

7 0

4 years ago

What is an equivalent expression for (x+2)+3y

Olegator [25]

Answer: (x+3)+2y

Step-by-step explanation:

yes

7 0

3 years ago

-12x + (-4x) + (-5x) =

Radda [10]

Answer:

=-21x

Step-by-step explanation:

-12-4 =-16

-16-5=-21

5 0

3 years ago

Read 2 more answers

To estimate the mean height μ of male students on your campus, you will measure an SRS of students. You know from government dat

denis-greek [22]

Answer:

a) The standard deviation of x must be 0.25 inches.

b) We need a sample of 125 to reduce the standard deviation of x⎯⎯⎯ to the value you found in part(a).

Step-by-step explanation:

The 68-95-99.7 states that:

68% percent of the measures of a normally distributed sample are within 1 standard deviation of the mean.

95% percent of the measures of a normally distributed sample are within 2 standard deviations of the mean.

99.7% percent of the measures of a normally distributed sample are within 3 standard deviations of the mean.

The standard deviation of the population is 2.8. This means that $\sigma = 2.8$ .

(a) What standard deviation must x⎯⎯⎯ have so that 95% of all samples give an x⎯⎯⎯ within one-half inch of μ?

We want to have a sample in which 2 standard deviations are within 0.5 inches of the mean.

So, the standard deviation of the sample must be:

$2s = 0.5$

$s = 0.25$

The standard deviation of x must be 0.25 inches.

(b) How large an SRS do you need to reduce the standard deviation of x⎯⎯⎯ to the value you found in part(a)?

We have that the standard deviation of a sample of length n is given by the following formula:

$s = \frac{\sigma}{\sqrt{n}}$ .

We want $s = 0.25$ and we have $\sigma = 2.8$ . So

$0.25 = \frac{2.8}{\sqrt{n}}$

$0.25\sqrt{n} = 2.8$

$\sqrt{n} = 11.2$

$\sqrt{n}^{2} = (11.2)^{2}$

$n = 125.44$

We need a sample of 125 to reduce the standard deviation of x⎯⎯⎯ to the value you found in part(a).

8 0

4 years ago