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2 years ago

What is 7 1/5written as a percent

2 answers:

3 0

720% is your answer! Think of it as money! 1/5 out of 100 is 20 cents, 7 is 7 dollars. 720 pennies all together so 720%! Hope this helps.

Please give brainliest❤️

umka21 [38]2 years ago

3 0

<h2>˜”*°•.˜”*°• Question •°*”˜.•°*”˜</h2>

<em>What is 7 1/5 written as a percent?</em>

<h2></h2><h2>˜”*°•.˜”*°• Answer •°*”˜.•°*”˜</h2>

720%

<h2>˜”*°•.˜”*°• Step by Step Explanation •°*”˜.•°*”˜</h2>

We know that 1/5 is the same as dividing 1 by 5.

or 1÷5.

Therefore, $7\frac{1}{5}$ $= 7+ (1/5)$

Then using Long Division for 1 divided by 5 we have

7 + 0.2 = 7.2

Converting our number to a percentage:

7.2(100)

= 720%

<h2>˜”*°•.˜”*°• Conclusion •°*”˜.•°*”˜</h2>

Therefore, 7 1/5 as a percent is 720%

If you need more help, don't fret to message me!

I'll be glad to assist.

<h2>˜”*°•.˜”*°• Details •°*”˜.•°*”˜</h2>

Subject: Mathematics

Concept: Conversions

Grade: Middle/High

<h2>˜”*°•.˜”*°• I hope this helped you! •°*”˜.•°*”˜</h2>

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3 years ago

A scientist begins with 250 grams of a radioactive substance. After 250 minutes, the sample has decayed to 32 grams. Rounding to

s2008m [1.1K]

Answer:

Part 1 : $A=250 e^{-0.008223t}$

Part 2 : Half life is 84 minutes ( approx )

Step-by-step explanation:

Part 1 : Suppose the function that shows the amount( in grams ) of the substance after t minutes,

$A=A_0 e^{kt}$

If t = 0 min, A = 250 grams,

$250=A_0 e^{0}$

$\implies A_0 = 250$

If t = 250, A = 32 grams,

$32 = A_0 e^{250k}$

$32 = 250 e^{250k}$

$0.128 = e^{250k}$

Taking ln both sides,

$\ln(0.128) = 250k$

$\implies k =\frac{\ln(0.128)}{250}=-0.008223$

Hence, the equation that shows this situation,

$A=250 e^{-0.008223t}$

Part 2 : If A = 250/2 = 125,

$125 = 250 e^{-0.008223t}$

$0.5 = e^{-0.008223t}$

Taking ln both sides,

$\ln(0.5) = -0.008223t$

$\implies t =\frac{\ln(0.5)}{-0.008223}\approx 84$

Therefore, the half life of the substance would be 84 minutes.

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Answer:

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