because it's value will always be same
The 4th term is a(4)
by the definition:
a(4) = a(3) * 10
we need a(3)!
a(3) = a(2) * 10
we need a(2)!
a(2) = a(1) * 10
Ah we know that a(1) = -11! Now we can go back to a(4).
So now we know that a(2) = -110,
that a(3) = -1100,
And that a(4) = -11000
there's the answer
Answer:
Last month's income: $1000
This month's income = $1200
Step-by-step explanation:
Number of subscribers for last month = 100
Fee per subscriber = $10
Sol, last month's income = 100(10) = 1000
This month, 30 new members joined and 10 of the existing members cancelled their subscription.
So, number of subscribers this month = 100 + 30 - 10 = 120
This month's income = 120(10) = 1200
