Therefore, the bones were 6612.5 years old at the time they were discovered.
<h3><u>Half life</u></h3>
Given that the radioactive element carbon-14 has a half-life of 5750 years, and a scientist determined that the bones from a mastodon had lost 57.5% of their carbon-14, to determine how old were the bones at the time they were discovered, the following calculation must be made:
- 50 = 5750
- 100 = 11500
- 57.5 = X
- 57.5 x 11500 / 100 = X
- 6612.5 = X
Therefore, the bones were 6612.5 years old at the time they were discovered.
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Answer:
2 is growth factor
Step-by-step explanation:
We are given expression
We can use formula
here ,
a is initial value
b is growth factor
so, we get
so, growth factor is 2
So, Number of leaves doubled after one week
So, 2 is growth factor
Answer:
Correct choice is B
Step-by-step explanation:
Let x% be your final test score, then the average of all test scores is
Since you must have an average between 80% and 89%, then
X is measured in percent, then the greatest value of x can be 100%. You get that
Answer:
110 chairs.
Step-by-step explanation:
(9x6) + (8x7) First multiply 9x6 and 8x7.
(54) + (56) In the first parenthesis, we have 9 tables with 6 chairs each. We are going to add that to the second parenthesis with 7 tables and 8 chairs each.
= 110 There are 110 chairs.
Answer:
The sum of two rational numbers will be rational.
Step-by-step explanation:
Rational numbers are numbers that can be written, are integers, and are not zero. So, any rational number plus another rational number will be rational because their sum will also be an integer, writable, and not a zero.
