answer:
N(t)=2×![1.7^{t}](https://tex.z-dn.net/?f=1.7%5E%7Bt%7D)
17
15
step by step explain:
before lesson (t=0), she knows 2 words.
after a week (t=1), she knows
2×(1+70%)=3.4 words
after one more week (t=2), she knows
3.4×(1+70%)=5.78 words
one more week later (t=3), she knows
5.78×(1+70%)=9.826 words
and so on ...
from pattern shown above, we know that she knows
2×
words after t weeks
so N(t)=2×![1.7^{t}](https://tex.z-dn.net/?f=1.7%5E%7Bt%7D)
after 4 weeks (t=4), she knows 2×
=16.7042≈17 words
for learning 5000 words, she need:
2×
=5000
=2500
t log(1.7)=log(2500)
t=![\frac{log(2500)}{log(1.7)}](https://tex.z-dn.net/?f=%5Cfrac%7Blog%282500%29%7D%7Blog%281.7%29%7D)
=14.7448727
≈15 (round up)
Answer:
5
Step-by-step explanation:
15/3=5 when the y are 3 it division
Answer:
C
Step-by-step explanation:
I just learned about this and took a test
See could have got the correct answer because if there was more numbers in the decimal you can round it to get .34 or because both answers have 12.3 and it doesnt matter about the other numbers after 3
Answer:
6/7 or .857
Step-by-step explanation:
It's called a calculator. Merry Christmas.