Answer:
she swam 1500 meters in 1/4 of the time and he swam 750 in half of his time. Hope this helps
Answer:
t = 6162 years
Step-by-step explanation:
This equation takes the form of
![N=N_{0}e^{kt}](https://tex.z-dn.net/?f=N%3DN_%7B0%7De%5E%7Bkt%7D)
We are given everything but the amount of C-14 at time t = 0. But we can figure it out from the info we ARE given. We are told that when the spear head is found it contains 54% of its original amount of C-14. Notice we are dealing in percents. If 54% remains when it is found, it started out with 100% of its amount. That's our N value. Filling in:
![100=54e^{.0001t}](https://tex.z-dn.net/?f=100%3D54e%5E%7B.0001t%7D)
Our goal is to get that t down from the exponential position that it is currently in. To do that we will need to eventually take the natural log of both sides, because ln's and e's "undo" each other, much like squaring "undoes" a square, or dividing "undoes" multiplication. So we take the natural log of both sides. On the right side, notice that when we take the natural log, the e disappears; it's "undone", gone. Before that, though, we will simplify by dividing both sides by 54. 100/54 = 1.851851852. So, altogether...
![ln(1.851851852)=.0001t](https://tex.z-dn.net/?f=ln%281.851851852%29%3D.0001t)
Simplifying by plugging the log of that number into our calculator, we get
.6161861395 = .0001t and
t = 6161.8613
Rounding to the nearest year, t = 6162 years
A number halfway of 20 and 30 is 25 so the answer would be 8.25:)
Yeah because there's 0 probability of it occurring and on the probability scale ( the number one ) 0=impossible
Answer: 10%
Step-by-step explanation: because if you subtract 50-40 you get 10 and then you just add the % sign and you can cross out d and b.
hope this helps you