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3 years ago

After learning how to fly, Wendy reduced her daily commute time by 75%. Previously, her commute took m minutes.

2 answers:

4 0

Answer: Since she reduced her daily commute time by 75%, her time now is 25% of her original. Thus, you have 0.25m or 25m%.

Step-by-step explanation:

just olya [345]3 years ago

4 0

100%-75%= 25%
25% converted to decimal for is 0.25

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4% of what days is 56 days

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2 years ago

Match the meaning of each of the following expressions help

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3 years ago

Read 2 more answers

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Step-by-step explanation:90/72

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3 years ago

Question 3 (1 point) Co-60 has a half life of 5.3 years. If a pellet that has been in storage for 26.5 years contains 14.5g of C

Zarrin [17]

Answer:

464 grams.

Step-by-step explanation:

Amount of substance:

The amount of substance after t years is given by an equation in the following format:

$A(t) = A(0)(1-r)^t$

In which A(0) is the initial amount and r is the decay rate, as a decimal.

Co-60 has a half life of 5.3 years.

This means that:

$A(5.3) = 0.5A(0)$

We use this to find r. So

$A(t) = A(0)(1-r)^t$

$0.5A(0) = A(0)(1-r)^{5.3}$

$(1-r)^{5.3} = 0.5$

$\sqrt[5.3]{(1-r)^{5.3}} = \sqrt[5.3]{0.5}$

$1 - r = 0.5^{\frac{1}{5.3}}$

$1 - r = 0.8774$

$A(t) = A(0)(0.8774)^{t}$

If a pellet that has been in storage for 26.5 years contains 14.5g of Co-60, how much of this radioisotope was present when the pellet was put in storage?

We have that $A(26.5) = 14.5$ , and use this to find A(0). So

$A(t) = A(0)(0.8774)^{t}$

$14.5 = A(0)(0.8774)^{26.5}$

$A(0) = \frac{14.5}{(0.8774)^{26.5}}$

[tex]A(0) = 464[tex]

464 grams.

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2 years ago

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NemiM [27]

Answer:

Please see attached images for solution.

Step-by-step explanation:

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2 years ago