A.
In the first generation we have 2 ancestors.
In the second generation we have 4 ancestors or
ancestors.
In the third generation we have 8 ancestors ot
ancestors.
We can see that each succesive generation has two times more members. The sum is:
To calculate number of ancestors we can use formula <span>for the sum of a geometric sequence. Geometric sequence is sequence of numbers that differ by a certain factor. This factor is called ratio. Formula is:
</span>
<span>Where:
S -> sum
a1 -> first member of a sequence
r -> ratio
n -> number of elements
For this question:
a1 = 2
r = 2
n = 40
</span>
<span>
b.
1 generation = 25 years
40 generations = 40 * 25 = 1000 years
c.
Total number of people who have ever lived = </span>
Number of ancestors in 40 generations =
The number of ancestors is greater than total number of people who have ever lived. This means that not all ancestors were distinct and that in each generation both men and women had children with more than one partner.
Write it as a mixed fraction 7/5 = 1 2/5
Answer:
1, 3, & 5
Step-by-step explanation:
Select three options.
1. The inequality should be written as 25 s less than 300.
2. The inequality should be written as 25 s greater than 300.
3. The circle is open.
4. The circle is closed.
5. The arrow points left.
I'm guessing these are the options? If so, please mark brainliest :)
Answer:the answer is B
Step-by-step explanation:
Answer:
The answer is B.
Step-by-step explanation:
Given that the total angles in a triangle is 180° so in order to find the value of x, you have to substract 60° and 80° from 180° :