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A pattern has term 1 = 9, term 2 = 13 and term 5 = 25, and it goes up by the same amount each time. Which rule fits?

Class 7Formulas and Rules from PatternsAlgebra

A $4 n + 9$
B $9 n$
C $5 n + 4$
D $4 n + 5$

Step-by-Step Solution

It goes up by 4 (9 → 13), so start with

4 n . n = 1

: 4 + 5 = 9 ✓;

n = 5

: 20 + 5 = 25 ✓. Rule:

4 n + 5

.

Answer: D)

4 n + 5

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