Answer:
120 grams will be left after 180 years.
Step-by-step explanation:
A radioactive half-life refers to the amount of time it takes for half of the original isotope to decay and its given by
where,
= quantity of the substance remaining
= initial quantity of the substance
= time elapsed
= half life of the substance
From the information given we know that:
- The initial quantity is 480 g,
- The half-life is 90 years,
- 180 years is the time elapsed.
And we want to find how much will be left. For this we use the above formula.
120 grams will be left after 180 years.
Answer:
The answer is c
Step-by-step explanation:
The middle line is in the same spot
The values on the number line are between 0 and 1. There are 8 points from 0. The distance between two consecutive points would be
1/8 = 0.125
Since the given point is on the second point after 0, the equivalent value would be
2 * 1/8 = 2/8
Dividing the numerator and denominator of 2/8 by 2, we have 1/4
Thus, the two equivalent fractions for the point on number line are
2/8 and 1/4
Sajia can sell 21 books she can sell if she comes back on sunday and the required inequality is
<em><u>Solution:</u></em>
Given that Sajia has 30 Books in her library
She sold 9 books at the thrift store on Saturday
To find: We have to write and solve an inequality to determine number of more books she can sell if she comes back on sunday
Let "x" be the number of more books she can sell if she comes back on sunday
<em><u>We can write a inequality as:</u></em>
Now moving 9 from L.H.S to R.H.S we get,
On solving 30 - 9 = 21,
So Sajia can sell 21 books she can sell if she comes back on sunday