Answer:
Explanation:
In the four hours before 13:00 the train traveled 4(80) = 320 km.
It needs to travel another 4(320) = 1280 km in the next 21:00 - 13:00 = 8 hrs.
1280 / 8 = 160 km/hr
M1u1 + m2u2 = m1v1 + m2v2
2 * 3 + 1 * 0 = 2 * 1 + 1 * v2
6 = 2 + v2
v2 = 6 - 2 = 4 m/s.
Savings account is where she can have access to her money anytime in case of an emergency.
<h3>What is a Savings account?</h3>
This is a type of account run by a financial institution which yields interests on deposits made.
This type of account usually comes with features in which the money can be withdrawn via an ATM card or by visiting the bank to collect it. This therefore makes it the most appropriate choice for Analisa.
Read more about Savings account here brainly.com/question/25787382
Answer: 86.47 g of carbon-14 must have been present in the sample 11,430 years ago.
Explanation:
Half-life of sample of carbon -14= 5,730 days
Let the sample present 11,430 years(t) ago = 
Sample left till today ,N= 0.060 g
![ln[N]=ln[N]_o-\lambda t](https://tex.z-dn.net/?f=ln%5BN%5D%3Dln%5BN%5D_o-%5Clambda%20t)
![\log[0.060 g]=\log[N_o]-2.303\times 0.00012 day^{-1}\times 11,430 days](https://tex.z-dn.net/?f=%5Clog%5B0.060%20g%5D%3D%5Clog%5BN_o%5D-2.303%5Ctimes%200.00012%20day%5E%7B-1%7D%5Ctimes%2011%2C430%20days)
![\log[N_o]=1.9369](https://tex.z-dn.net/?f=%5Clog%5BN_o%5D%3D1.9369)
86.47 g of carbon-14 must have been present in the sample 11,430 years ago.
