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ki77a [65]
4 years ago
9

Jennifer and her friends were bored one day and were playing with a tank of water whose dimensions were 48 centimeters long 30 c

entimeters wide, and 36 centimeters high. They had some heavy solid box shaped items that had a 12*12 centimeters square base and were 20 centimeters tall they put water in the tank so that it was 28 centimeters deep. and started carefully dropping the box shaped items into the tank and waching

Mathematics
1 answer:
Diano4ka-milaya [45]4 years ago
3 0
Draw an illustration describing the problem as shown in the attached picture. The black box drawn represents the tank of water with dimensions labeled 30cm×48cm×36 cm. Jennifer and her friends threw heavy solid objects represented by the blue box. It has dimensions of 12cm×12m×20 cm. These boxes occupy the bottom of the tank up to a height of 28 cm drawn by the blue lines. Now, I think the question will be how many of those heavy solid objects will fill up the bottom of the tank. The other question would be, how much is the volume of water displaced by the heavy solid objects.

First, let's compute the volume of each solid object labeled as v.
v = 12×12×20
v = 2,880 cm³

Next, let's solve the volume to be filled up by these solid objects, labeled as V.
V = 30×48×28
V = 40,320 cm³

This is the volume of water displaced. When Jennifer and her friends drop the solid objects, each volume of object dropped corresponds to the same volume of water that overflows from the tank.

Next, we solve how many solid objects does it take to occupy 40,320 cm³.
Number of blocks =  40,320 cm³/2,880 cm³
Number of blocks = 14

Therefore, it would take 14 heavy solid objects to displace 40,320 cm³ of water.

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tankabanditka [31]

Answer:

Given

x+y+z=0

⟹x+y=−z

Cubing on both sides

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⟹x 3+y 3+3xy(−z)=−z 3

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Step-by-step explanation:

Hope it is helpful.....

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PLEASE HELP ME NOW URGENT
timama [110]

ANSWER

y   = 3 \pm \sqrt{21}

EXPLANATION

The quadratic equation is:

{y}^{2}  - 6y - 12 = 0

Group variable terms:

{y}^{2}  - 6y = 12

Add the square of half, the coefficient of y to both sides.

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8 0
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The average age of online consumers a few years ago was 24.1 years. As older individuals gain confidence with the​ Internet, it
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Answer:

The correct option is (C).

Step-by-step explanation:

A null hypothesis is a sort of hypothesis used in statistics that intends that no statistical significance exists in a set of given observations.  

It is a hypothesis of no difference.

It is typically the hypothesis a scientist or experimenter will attempt to refute or discard. It is denoted by H₀.

Whereas the alternative hypothesis is a contradicting statement tot he null hypothesis. It is denoted by Hₐ.

In this case we need to test whether the average age of online consumers has increased or not.

From previous data we know that the average age of online consumers a few years ago was 24.1 years.

A one-sample mean test can be used to determine whether the mean age has increased or not.

The hypothesis for the test can be defined as follows:

<em>H₀</em>: The average age of online consumers is 24.1 years, i.e. <em>μ</em> = 24.1.

<em>Hₐ</em>: The average age of online consumers is more than 24.1 years, i.e. <em>μ</em> > 24.1.

Thus, the correct option is (C).

6 0
4 years ago
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