Question

Need help with Arithmetic and geometric sequence setting up

Answer 1

First term a=2, common difference d=3, formula

$a_n = a + d(n-1)$

$a_n = 2 + 3(n-1)$

$a_{33} = 2 + 3(33-1) = 98$

Answer: 98

First five terms, first term 5, common ratio 2. Write down 5, keep multiplying by two until you've written down five terms.

Answer: 5 10 20 40 80

Savings plan. Anybody see the flaw in this plan?

First term 1, common ratio 5.

$a_n = 1 \cdot 5^{n-1}$

$a_8 = 5^7 = 78,125$

Answer: $78,125