can i get help w/ math please ss below

Question

nettym · Answer

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nettym · Answer

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dude · Answer

Geometric sequences are written as $a_n=a_1r^{n-1}$

$a_1$ = first term
r = rate
n = n'th term (Position of the "n" number in the sequence)

We need to find the rate first (You can divide the second term over the first. You can recheck whether its true by diving the third term over the second)

darkknight · Answer

$$a _{n} =a _{1}+d(n-1)$$
is the formula for arithmetic sequence
where $$n$$= nth term
$$a _{1}$$ = first term
$$d$$ = common ratio
you need to figure the value of the nth term, which is 10

darkknight · Answer

And then after that, the sum of the first nterms of an arithmetic sequence is 
$$\sum=n((a_{1}+a _{n})/2)$$

nettym · Answer

$\color{#0cbb34}{\text{Originally Posted by}}$ @dude
Geometric sequences are written as $a_n=a_1r^{n-1}$

$a_1$ = first term
r = rate
n = n'th term (Position of the "n" number in the sequence)

We need to find the rate first (You can divide the second term over the first. You can recheck whether its true by diving the third term over the second)
$\color{#0cbb34}{\text{End of Quote}}$
tyy!

darkknight · Answer

oops that was supposed to be the sum, for clarification

darkknight · Answer

np

darkknight · Answer

sum =$$\sum$$

So you just have tofind that, first find $$a _{n}$$

nettym · Answer

ty :)

darkknight · Answer

(:

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