Answer:
Step-by-step explanation:
Answer:
4
Step-by-step explanation:
The sum of n terms of a geometric series with first term a1 and common ratio r is given by ...
Sn = a1·(r^n -1)/(r -1)
for r=5 and n=6, this becomes ...
15624 = a1·(5^6 -1)/(5 -1) = a1·(15624/4)
Then we have ...
1 = a1/4 . . . . . divide by 15624
4 = a1 . . . . . . multiply by 4
The first term of the series is 4.
Answer:
16,383.33 years ( approx )
Step-by-step explanation:
Given equation that shows the amount of carbon-14 after t years,

Where,
= initial amount,
∵ 14% of
=
= 


Taking ln both sides,



Hence, the painting would be 16383.33 years old ( approx )
Answer:
28
Step-by-step explanation:
When there is a - symbol directly outside parenthesis, you always assume a 1 to be there.
-(-28) = -1(-28)
-1 × -28 = 28