12. How much more energy is released by an earthquake with a magnitude of 8.0

Mathematics

1 answer:

Nadusha1986 [10]3 years ago

7 0

Answer:

Lets conside the order of magnitude
We have a different of 8.0- 6.0=2.0
An 8 magnitude has 63.09 ×10^15 joules
A 6 magnitude has 63.09×10^12 J
Which is 1000 times more energy
Your answer choices are incorrect
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I need the answers plz

enyata [817]

In order to simplify an expression you have to have the same variables, to the same power.

1a) There are no more H's or numbers without a variable.

1b) The variables do not match.

1c) The variable is to a different power so it can't be simplified.

So to simplify you combine your "like terms"

2a,b, and c are correct :)

2d) already simplified

2e) since the variables are the same, just focus on the numbers (x=h since it won't let me use it) answer: 6x
$10x - 4x \\ 10 - 4 = 6 \\ 6x$
2g) For this one 9 has no variable and no like terms, so it stays by itself, just focus on the a's (x=a) answer: 9+4x
$9 + 7x - 3x \\ 7 - 3 = 4 \\ 9 + 4x$
2j) answer: 11y^2+5y
$8y + 6y {}^{2} - 3y + 5y {}^{2} \\ 8y - 3y = 5y \\ 6y {}^{2} { + 5y} {}^{2} = 11y {}^{2} \\ 11y {}^{2} + 5y$

4 0

4 years ago

At noon a tank contains 6 cm of water after several hours it contains 3 cm of water what is the percent inecrease of water in th

Hitman42 [59]

Question:

At noon a tank contains 6 cm of water after several hours it contains 3 cm of water what is the percent decrease of water in the tank

Answer:

The percent Decrease of water in the tank is 50%

Step-by-step explanation:

Given:

Initial amount of water in the tank at the noon = 6 cm

amount of water remained in water after several hours = 3 cm

To Find:

The percent decrease =?

Solution:

The percent decrease in the tank

=> $\frac{\text {water present after some hours }}{\text {initial water contained in the tank }} \times 100$

Substituting the values

=> $\frac{3}{6} \times 100$

=> $\frac{1}{2} \times 100$

=> $\frac{100}{2}$

=> 50

5 0

3 years ago

What is the surface area of the right rectangular prism?

scoundrel [369]

<h3>Answer: Choice A) 252 in^2</h3>

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Explanation:

Refer to the diagram below.

The red rectangle is 6 inches by 12 inches, so its area is 6*12 = 72 square inches. There are two of these rectangles (one on top, one on the bottom). That accounts for 2*72 = 144 square inches so far.

The purple rectangles are 3 inches by 12 inches, yielding an area of 3*12 = 36 square inches each. That's another 2*36 = 72 square inches when we account for the front and back purple rectangles.

The green rectangles are 6 inches by 3 inches. Each green rectangle is 6*3 = 18 square inches. Having two of them means we'll add on 2*18 = 36 square inches.

Overall, the entire surface area is the sum of all the areas we calculated: 144+72+36 = 252 square inches, which is choice A

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