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3 years ago

11 - 3{ x + 2} = 9 + x what is the value of x

Mathematics

1 answer:

solmaris [256]3 years ago

8 0

Answer: -1

Step-by-step explanation:11 - 3(x+2) = 9+x

11 - 3x - 6 = 9 + x

11 - 6 - 3x = 9 + x

5 - 3x = 9 + x

-3x - x = 9 - 5

-4x = 4

x = 4 ÷ -4

x= -1

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The manager of a fleet of automobiles is testing two brands of radial tires and assigns one tire of each brand at random to the

Darya [45]

Answer:

Brand 1 Brand 2 Difference

37734 35202 2532

45299 41635 3664

36240 35500 740

32100 31950 150

37210 38015 −805

48360 47800 560

38200 37810 390

33500 33215 285

Sum of difference = 2532+ 3664+740+150 −805+ 560 +390 +285 = 7516

Mean = $d=\frac{7516}{8}$

Mean = $d=939.5$

a) d= 939.5

$\text{Sample Standard deviation, s} = \sqrt{\dfrac{(x-\bar{x})^2}{n-1}}$

$=\sqrt{\dfrac{(2532-939.5)^2+(3664-939.5)^2+(740-939.5)^2 ...+(285-939.5)^2}{8-1}}$

=1441.21

b)SD= 1441.21

c)Calculate a 99% two-sided confidence interval on the difference in mean life.

confidence level =99%

significance level =α= 0.01

Degree of freedom = n-1 = 8-1 =7

So, $t_{\frac{\alpha}{2}}=3.499$

Formula for confidence interval $= \left( \bar{X} \pm t_{\frac{\alpha}{2}} \times \frac{s}{\sqrt{n}} \right)$

Substitute the values

confidence interval $= 939.5 \pm 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

confidence interval $= 939.5 - 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$ to $= 939.5 + 3.499 \times \frac{1441.21}{\sqrt{8}} \right)$

Confidence interval $−843.396\$ to $2722.396$

8 0

3 years ago

Find the value of x to the nearest tenth.

Svetach [21]

Cos(angle) = Adjacent Leg / Hypotenuse

cos(35) = 9 / x

x = 9 / cos(35)

x = 10.99

Rounded to nearest tenth = 11.0

6 0

4 years ago

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5 plus 2 minus 6 times 4

nevsk [136]

Answer:

714

Step-by-step explanation:

5+2=7

7-6=1

1x4=4

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3 years ago

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Pls help me i will mark brainliest if you are right !

tekilochka [14]

Answer:

second option

Step-by-step explanation:

diameter= 22 cm

radius = diameter/2

=22/2

11 cm

volume of a sphere = $\frac{4}{3}*pie* r^3$

= $\frac{4}{3} * 3.14 *11^3$

=4.186666 * 1331

=5572 . 5 cubic centimeters (cm^3)

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3 years ago

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morpeh [17]

Answer:

1) 24x-72; 2) 6x-18; 3) 2x-9

Step-by-step explanation:

You can divide it or multiply it by whatever number it is to make it a whole number, not a decimal. Or else it will be even more difficult.

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