Answer:
16 and -15
Step-by-step explanation:
Let the numbers be x and y
x+y = 1 ..............(1)
5x + 4y = 20 .........(2)
Solve simultaneously using elimination method by multiplying equation 1 by 5 to eliminate x
5x + 5y = 5
5x + 4y = 20. Subtract the eqns from each other
---------------------
5y - 4y = 5-20
y = -15
Put value of y into equation 1
x+y = 1
x -15 = 1
Add 15 to both sides
x = 1+15
x = 16
Therefore the numbers are 16 and -15
I hope this was helpful, please mark as brainliest
The tree died about 3357 years ago.
Explanation:
The half life of carbon - 14 is given by
where
Substituting these values in the above equation, we get,
Taking In on both sides of the equation, we get,
Since, only 66% of Carbon - 14 remains after the time T.
Thus, we have,
Taking In on both sides of the equation, we get,
Thus, the tree died about 3357 years ago.
Answer:
, explanation for how to get there
Step-by-step explanation:
If we have the equation , we want to isolate c on one side and find it's value.
Let's first divide both sides by 4.
Now let's solve for the absolute value. We know that:
or
Possibility 1:
Subtract 3c from both sides:
Possibility 2:
Add 4c to both sides:
Subtract 5 from both sides:
Divide both sides by 7:
Plugging both of these values into the equation, we can see that only 5 works.
Hope this helped!