Algebra

Sarah decides to put a bird feeder in her back garden. That day she sees $6$6 birds use the feeder. The next day she sees $12$12 birds, and on the third day she sees $18$18 birds.

a

If the number of birds continues to follow the pattern, how many birds will Sarah see on the fourth day?

b

If the pattern continues, write an expression for the number of birds Sarah will see after $y$`y` days.

Easy

Approx a minute

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