4a. [2 marks](Series/Sequence) Mia baked a very large apple pie that she cuts into slices to share with her friends. The smallest slice is cut first. The volume of each successive slice of pie forms a geometric sequence. The second smallest slice has a volume of 30cm. The fifth smallest slice has a volume of 240cm. Find the common ratio of the sequence. 4b. [2 marks] Find the volume of the smallest slice of pie. 4c. [2 marks] The apple pie has a volume of 61425cm. Find the total number of slices Mia can cut from this pie.