Evaluate (2/3) exponent 2

15 points urgent please help.

Dima020 [189]

Answer:

ima take a wild guess and say a and c is right (im d u m b so i d k)

Step-by-step explanation:

4 0

1 year ago

A coin is tossed 72 times. What is a reasonable prediction for the number of

Aneli [31]

Answer :

That’s it, the probability of getting tail on a single coin toss times the number of observations.

In this case, 1/2 * 72 = 36

However, there’s something called chance error. How much do you expect the result to differ from the expected value? It can be calculated as follows:

The Standard Deviation of this experiment is √(0.5)(0.5) =0.5

The Standard Error is √72 (0.5) ≈ 4.18330 round to the nearst tenth is 4

So, the expected value is 36, give or take 4.

And since the number of tails in a toss coin experiment is normally distributed, then you can expect the number of tails to be between -2 and +2 SEs from the expected value 95% of the time.

In other words, if you repeat this experiment a large number of times, you can expect to obtain between 27 and 43 tails 95% of the time.

Hope this helps

4 0

2 years ago

#2: Solve the linear system below using the elimination method. Type your

MariettaO [177]

The given linear system is:

$\displaystyle \left \{ {{5x+7y=33} \atop {11x+7y=39}} \right.$

The question is asking to solve using elimination. When eliminating, you can either eliminate x or y. In this system, y is much easier to eliminate. The y variable in both equations are 7y. To eliminate, one of them has to be negative, so multiply one of the equations by -1.

I will be multiplying the second equation by -1.

$\displaystyle (11x + 7y = 39) \times -1 = -11x-7y=-39$

Rewrite the system:

$\displaystyle \left \{ {{5x+7y=33} \atop {-11x-7y=-39}} \right.$

Subtract:

$5x+7y=33\\-11x-7y=-39$

$5x-11x=33-39\\-6x=-6$

Lastly, you need to leave the variable x alone. The variable is currently -6x or -6 times x. To remove it, you need to do the opposite of it, which is dividing by -6.

$\displaystyle \frac{-6x}{-6} =\frac{-6}{-6}$

$\displaystyle x=1$

Now that you have the value of x, substitute it into one of the equations to find y. I will be substituting it into the first equation.

$5x+7y=33 \rightarrow 5(1)+7y=33$

Open the parentheses and multiply:

$5+7y=33$

Move 5 to the other side to leave the variable alone:

$5+7y-5=33-5$

You will be subtracting since you're "removing" it by doing the opposite of it.

$7y=28$

Lastly, divide both sides by 7 to leave y alone.

$\displaystyle \frac{7y}{7} =\frac{28}{7}$

$y=4$

$\displaystyle (x,y) \rightarrow (1, 4)$

The answer is (1, 4).

8 0

1 year ago

Read 2 more answers

a bookcase is to be constructed as shown in the figure below. the height of the bookcase is 2 feet longer than the length of a s

In-s [12.5K]

The length of the shelf is 10 feet while its height is 10 feet.

<h3>Equation</h3>

Equation is an expression used to show the relationship between the sides and angles of a right angled triangle.

Let x represent the shelf length and y represent the shelf height.

The height of the bookcase is 2 feet longer than the length of a shelf. hence:

y = x + 2
-x + y = 2 (1)

Also, 22 feet of lumber is available:

x + y = 22 (2)

From equation 1 and 2:

y = 12, x = 10

The length of the shelf is 10 feet while its height is 10 feet.

Find out more on equation at: brainly.com/question/13763238

4 0

1 year ago

Choose the function whose graph is given by:

Sophie [7]

Answer:

C.y=sin(x-2)

Step-by-step explanation:

Using the topic of transformation of functions(rules shown in picture above)

the the (x-2) moves the graph to places to the right

and as the sine graph goes through 0 and so you add 2 to the right (but there is a problem in the graph should in the picture as it should me labeled 0,90,180,270,360 not these small numbers)

hope it helps!! :)

5 0

1 year ago