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Elden [556K]
3 years ago
13

8 times the difference of a number and 3 is 64

Mathematics
2 answers:
UNO [17]3 years ago
7 0
Your answer is ....


8(n-3) = 64
german3 years ago
5 0
8(x-3)=64

remember "is" can stand for equal
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The area of a circle is 49 cm2. Find the circumference of the circle.
Nataly_w [17]

~Hello There!~

The formula to find the area of a circle is:

\pi r^{2}

We already know this answer, so we write it as:

\pi r^{2} =49

We need to calculate the radius (r) from this so divide both sides by \pi

r^{2} = 15.59718442

Square root this to get r

r = 3.949327085

The formula for circumference is \pi *d

(d is the diameter )

Double the radius to get the diameter:

d = 7.89865417

Multiply this value by \pi to get the answer

The circumference is 24.81435391

Hope This Helps You!

Good Luck :)

Have A Great Day ^_^

- Hannah ❤

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mafiozo [28]

Answer:

The correct statements are :

1. The enthalpy of the reaction is -184.6 kJ, and the reaction is exothermic.

2. The enthalpy of the reaction is 184.6 kJ and the reaction is endothermic.

Step-by-step explanation:

Enthalpy of reaction is amount of heat absorbed or released during the reaction.

If energy is required, enthalpy of reaction is positive and if energy is released the enthalpy of reaction is negative.

Exothermic reaction: The chemical change is accompanied by the release of heat energy

Endothermic reaction: The chemical change is accompanied by the absorption of heat energy.

So, from the above definitions, it is clear that the enthalpy of reaction of a exothermic reaction is negative and that of a endothermic reaction is positive.


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Answer:cam

Step-by-step explanation:

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