Identify a3 of this sequence: 0.25, 0.5, 0.75, 1, 1.25, 1.5, ... a3=

This is an arithmetic sequence (the difference is constant - d).

a 1 = 0.25, a 2 = 0.5, a 3 = 0.75, a 4 = 1, ...

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

So: a 1 = 0.25 and d = 0.25

a 3 = 0.25 + (3 - 1) * 0.25 = 0.25 + 2 * 0.25 = 0.25 + 0.50 = 0.75

Answer:

a 3 = 0.75