What is the exact value of the expression √72 - √8 + √128? Simplify if possible.

1 answer:

4 0

√72 can be written as 3√8 , √128 as 4√8.. Here, we have to solve √72 -√8 +√128 .. i.e, 3√8 - √8 + 4√8.. which is equal to 6√8 or can be written as 12√2 //

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Answer:

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Step-by-step explanation:

we are given half-life of PO-210 and the initial mass

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where:

f(t) is the remaining quantity of a substance after time t has elapsed.
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since it halves every 140 days our T is 140 and t is 420. as the initial mass of the sample is 5 our a is 5

thus substitute:

$\displaystyle f(420)=5\cdot{0.5}^{420/140}$

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