A radioactive substance decays at a rate of 25% every 10 years. Which equation represents the amount of the substance (S) remaining from 100 grams after 300 years?

Step-by-step explanation:

Given

--- Initial Amount

every 10 years

Required

The remaining amount after 300 years

To do this, we make use of:

Where

r = decay rate

T = the period of decay

In 300 years, there are 30 periods of 10 years.

i.e.

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

contact me if you have any questions you are welcome.

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step-by-step explanation:

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