Gum.

A carrot

The outside.

Curiosity.

E, the first letter.

Answer is both 1 and 9 whether your using PEMDAS or BODMAS

G

324

70

15 + 1x1 = 16
16 + 2x2 = 20
20 + 3x3 = 29
29 + 4x4 = 45
45 + 5x5 = 70

An overused joke.

The tide.

Second place.