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NEED HELP ASAP WITHIN 10 MINUETS MY ASSIGNMENT IS DO PLEASE HELP!

A radioactive substance decays at a rate of 2% per day. If there are 50 grams of the
substance left after 34 days, how much was there at the beginning of the 34 days?
Round to two decimal places.

Respuesta :

veewoolf11

Answer: I do not have expertise on this so I won't answer the exact problem but this sounds like exponential decay, where you have the decay rate. I know that the formula for exponential decay is: y = a(1 - r)^x

I'm sorry if this does not help much I don't have expertise on this. Sorry again.

Step-by-step explanation:

AnonymousMath

Answer:

156.25 grams

Step-by-step explanation:

Well, for starters we know that the substance decays by 2% each day and its been decaying for 34 days. Therefore, the substance has decayed by 68%        

34 x 2 = 68

Hence, 50 grams is 32% because the substance has already decayed by 68%

100 - 68 = 32

So now we know 50 grams is 32%. Now we need to find how much 100% is.

50 - 32%

X   - 100%

We cross multiply.

50 x 100 = 5000

And divide.

5000 / 32 = 156.25

Thus, in the beginning, there were 156.25 grams in the substance.

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