What is the root word in the word 'unhappiness'?

A. HAPPY

Identify the pattern: A, C, E, G, ?

A. H

If the sequence is A, C, E, G, what letter comes next?

A. I

If the sequence is A, C, E, G, what is the next letter?

B. H

If the pattern is 3, 6, 9, 12, what is the next number?

A. 15