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2 years ago

6

Element X is a radioactive isotope such that every 91 years, its mass decreases by half. Given that the initial mass of a sample

of Element X is 80 grams, how long would it be until the mass of the sample reached 68 grams, to the nearest tenth of a year?

1 answer:

vaieri [72.5K]2 years ago

7 0

Answer:

21.3

Step-by-step explanation:

Delta math answer.

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Simplify 2(x - 4) + 7(x + 2).

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Answer:

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Step-by-step explanation:

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7(x+2)= 7x+14

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3 years ago

You randomly draw two cards from a standard deck of playing cards without replacement.what is the probability that both of the c

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3 years ago

3/4 x 3 2/5 - 5/5(find the value of each of the following)

Triss [41]

The value of the given expression is $\frac{-13}{20}.$

Solution:

Given expression is $\frac{3}{4} \times3\frac{2}{5}-\frac{5}{5}$ .

Let us first convert mixed fraction into improper fraction.

$3\frac{2}{5}=\frac{(3\times5)+2}{5}=\frac{17}{5}$

Substitute this in the given expression.

$\frac{3}{4} \times3\frac{2}{5}-\frac{5}{5}=\frac{3}{4} \times\frac{7}{15}-\frac{5}{5}$

$=\frac{21}{60}-\frac{5}{5}$

To simplify the above expression, 21 and 60 are cancelled by 3.

$=\frac{7}{20}-\frac{1}{1}$

Do cross multiplication to make the denominator same.

$=\frac{7}{20}-\frac{20}{20}$

$=\frac{7-20}{20}$

$=\frac{-13}{20}$

The value of the given expression is $\frac{-13}{20}.$

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3 years ago

I need an answer to this question

inna [77]

Answer:

Hi its -29/11

Step-by-step explanation:

Divide both sides by 11

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