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andre [41]
1 year ago
10

One of the radioactive isotopes used in chemical and medical research is iodine-125, which has a half-life of 61 days. how long

would it take for 0.25 g to remain of a 1.00 g sample of iodine-125?
Mathematics
1 answer:
Oksana_A [137]1 year ago
5 0

Answer:122 days

Step-by-step explanation:

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Cayden wants to buy a television that costs $600, including taxes. To pay for the television, he will use a payment plan that re
kobusy [5.1K]

well, the regular cost of the TV is 600 bucks, that includes taxes already, so is just 600 flat.

the payment plan makes Cayden pay 225 first, leaving 375 for periodic payments for 6 months, each payment of 74.50.

well, 74.5*6 = 447, so Cayden is paying 225 + 447 = 672, so the increase is 72 bucks.

If we take 600 to be the 100%, how much is 72 off of it in percentage?

\begin{array}{ccll} amount&\%\\ \cline{1-2} 600&100\\ 72&x \end{array}\implies \cfrac{600}{72}=\cfrac{100}{x}\implies \cfrac{25}{3}=\cfrac{100}{x} \\\\\\ 25x=300\implies x=\cfrac{300}{25}\implies x=12

7 0
2 years ago
PLEASE HELP ME!!!!!!!!!!!!!!!
Pachacha [2.7K]

Answer:

15 degrees

Step-by-step explanation:

angle a= (180-90)/2=90/2=45 degrees

angle QRP = 60

Angle b = 60-45=15 degrees

8 0
3 years ago
5x+7/2=3/2x-14 solve this
Alchen [17]
X=-2

You can also check by plugging -2 in for x. Here is a picture. Please notify me if I made an error!

3 0
3 years ago
Please answer question now
IceJOKER [234]
The answer is 41.7 km^2
7 0
3 years ago
2.85 as a mixed number
WARRIOR [948]
The number 2.85 can be writen using the fraction 285/100 which is equal to 57/20 when reduced to lowest terms.
It is also equal to 2 17/20 when writen as a mixed number.
You can use the following approximate value(s) for this number:57/20 =~ 2 6/7 (if you admit a error of 0.250627%)2.85 =~ 2 5/6 (if you admit a error of -0.584795%)2.85 =~ 3 (if you admit a error of 5.263158%)
3 0
3 years ago
Read 2 more answers
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