Question

Can someone help me with this easy math problem.

Answer 1

It's a geometric sequence

• common ratio=r=84/21=4
• First term 1.3125

Formula:&

`\\ \sf\longrightarrow a(n)`

`\\ \sf\longrightarrow ar^(n-1)`

`\\ \sf\longrightarrow 1.3125(4)^(n-1)`