To answer for the first question, divide 828 days with the half-life, 138 days. There are 6 half-lives of polonium-210 in 828 days.
For the second question, raise 0.5 to number of half-lives which was calculated in a, 6. Then, multiply with the initial amount, 61 g. Thus, after 828 days there are only about 0.9531 g of polonium-210 left.
65/100 = 13/20
(divide by 5 on both sides)
Hope this helped!
Answer:
5, -25, etc
Step-by-step explanation:
It involves multiplying to get each answer, so it is geometric
Answer:
x=6
Step-by-step explanation:
Since it's a parallelogram both of these parallel sides are equal so you can set up an equation like this:
4x-8=2x+4
Now solve.
4x=2x+12
2x=12
x=6
