- #1
I'm clever
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I'm stuck on these three maths questions.
1) In a geometric progression, the sum to infinity is four times the first term.
(i) Show that the common ratio is 3
(ii) Given that the third term is 9, find the first term.
(iii) Find the sum of the first twenty terms.
2) Solve the equation log_2 x + 2 log_2 3 = log_2(x + 5).
3) Find:
200
Σ (3n+2)
n=101
for 3) Should I subtract the series cause it doesn't start with 1?
1) In a geometric progression, the sum to infinity is four times the first term.
(i) Show that the common ratio is 3
(ii) Given that the third term is 9, find the first term.
(iii) Find the sum of the first twenty terms.
2) Solve the equation log_2 x + 2 log_2 3 = log_2(x + 5).
3) Find:
200
Σ (3n+2)
n=101
for 3) Should I subtract the series cause it doesn't start with 1?