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3 years ago

The eurasian plate travels the slowest, at about 0.7 cm/y. How long would it take the plate to travel 3 cm?

Mathematics

1 answer:

damaskus [11]3 years ago

5 0

Simply divide 3 by 0.7,

$3 \div 0.7 = \frac{30}{7} = 4 \frac{2}{7}$

Or ≈ 4.28571 which is ≈ 4 years.

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George has a small coin collection. He has collected 16 gold coins, 28 silver coins, 32 copper coins, and4 bronze coins. At a fl

erastovalidia [21]

16 +28+32+4=80 80 total coins x.15 =12 coins sold

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3 years ago

The Ball Corporation's beverage can manufacturing plant in Fort Atkinson, Wisconsin, uses a metal supplier that provides metal w

vampirchik [111]

Answer:

The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm

Step-by-step explanation:

We have that to find our $\alpha$ level, that is the subtraction of 1 by the confidence interval divided by 2. So:

$\alpha = \frac{1-0.95}{2} = 0.025$

Now, we have to find z in the Ztable as such z has a pvalue of $1-\alpha$ .

So it is z with a pvalue of $1-0.025 = 0.975$ , so $z = 1.96$

Now, find the margin of error M as such

$M = z*\frac{\sigma}{\sqrt{n}}$

In which $\sigma$ is the standard deviation of the population and n is the size of the sample.

$M = 1.96\frac{0.000586}{\sqrt{59}} = 0.0002$

The lower end of the interval is the sample mean subtracted by M. So it is 0.2905 - 0.0002 = 0.2903 mm

The upper end of the interval is the sample mean added to M. So it is 0.2905 + 0.0002 = 0.2907 mm

The 95 percent confidence interval for the true mean metal thickness is between 0.2903 mm and 0.2907 mm

4 0

3 years ago

What is the square root of -1?

Gelneren [198K]

Answer:

Step-by-step explanation: im guessing 1

6 0

3 years ago

ASAP! I really need help with this question! No nonsense answers, and please attach the solution.

uysha [10]

Answer:

$\boxed{\sf Option \ 4}$

Step-by-step explanation:

$\sqrt{2x-3} +x=3$

Subtract x from both sides.

$\sqrt{2x-3} +x-x=-x+3$

$\sqrt{2x-3}=-x+3$

Square both sides.

$( \sqrt{2x-3})^2 =(-x+3)^2$

$2x-3=x^2-6x+9$

Subtract x²-6x+9 from both sides.

$2x-3-(x^2-6x+9 )=x^2-6x+9-(x^2-6x+9)$

$-x^2 +8x-12=0$

Factor left side of the equation.

$(-x+2)(x-6)=0$

Set factors equal to 0.

$-x+2=0\\-x=-2\\x=2$

$x-6=0\\x=6$

Check if the solutions are extraneous or not.

Plug x as 2.

$\sqrt{2(2)-3} +2=3\\ \sqrt{4-3} +2=3\\\sqrt{1} +2=3\\3=3$

x = 2 works in the equation.

Plug x as 6.

$\sqrt{2(6)-3} +6=3\\ \sqrt{12-3} +6=3\\\sqrt{9} +6=3\\3+6=3\\9=3$

x = 6 does not work in the equation.

5 0

3 years ago

Read 2 more answers

A flying disc in the shape of a circle has a circumference of 8 inches. What is the radius of the flying disc.

mafiozo [28]

Answer:

Step-by-step explanation:

The formula for circumference is:

$C=2\pi r$

We know that the circumference is 8π inches. So, substitute 8π for C:

$8\pi =2\pi r$

Solve for r. Divide both sides by 2π. So:

$r=\frac{8\pi}{2\pi}=4$

Therefore, the radius is 4 inches.

Hence, our answer is A.

7 0

3 years ago