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Free_Kalibri [48]
3 years ago
12

A 78 gram sample of Uranium loses half of its mass each year. What is the exponential equation? Please explain why A is the corr

ect answer
A. y=78(0.5)^x


B. y=78(1.5)^x
Mathematics
1 answer:
Fiesta28 [93]3 years ago
8 0

Answer:

A

Step-by-step explanation:

The first answer is correct because we have a decay factor.

The sample is losing mass, so the number that is being multiplied by a power of x must be less than 1.

If the second answer were used, then the sample would be gaining mass.

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Answer:

4). The Washington Monument is 169.2-m tall.

Step-by-step explanation:

4). We know this because...

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Wash.        x       65.8

We then know to cross-multiply to get:  

1.8(65.8) = 0.7x

Which simplifies down to:

118.44 = 0.7x

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Answer:

5). The pond is 180ft wide.

Step-by-step explanation:

5). We know this because...

90       120

-----  = -------

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We then know to cross-multiply to get:

90x = 120(135)

Which simplifies down to:

90x = 16200

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Answer:

6). The height of the clock tower is 13ft 9in.

Step-by-step explanation:

6). We know this because...

person       5.5         4

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We then know to cross-multiply to get:

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7 0
3 years ago
Whats the perimiter of the following rectangle? The side says x - 2 and the bottom says 2x + 1​
irakobra [83]

Answer:

6x-2

Step-by-step explanation:

The perimeter of a rectangle is found by

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  =2( x-2 + 2x+1)

Combine like terms

P = 2(3x-1)

Distribute

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8 0
3 years ago
11. please help me outt ill mark you brainlist !
alex41 [277]
I’m not positive, but I think the answer is C because when you look at the big triangle, it looks like you divide each coordinate by 3 (or multiply it by 1/3) to get the small triangle.

e.g. 6 * 1/3 = 2, 3 * 1/3 = 1
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3 years ago
PLS HELP!!!
elena-s [515]
The answer is a h(1.25)=20
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3 years ago
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Aloiza [94]

Answer:

The answer is B. inches....

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