Solution:

Pi(pi-symbol) + Rate (of acceleration)
= Pirate

Solution:

1296

Solution:

To(number 2) + Infinity(Symbol) + Beyond(B on D)
= To Infinity and beyond

Solution:

For(4) + a + change(delta/change symbol)
= For a change

Solution:

Route(Root symbol) + 66
= Route66

Solution:

Falling In Love

Solution:

Misunderstood

Solution:

Swim Underwater

Solution:

40 triangles

16 + (8x2) + (4x2) + (1x2) + (1x2)

Solution:

20 Triangles

Explanation:
Let us consider the smallest side of the triangle as 1 cm.
Now count and you will find out that we have 1 + 5 + 5 + 1 = 12 triangles with the side 1 cm.
Number of triangles with side 2 cm = 1 + 2 (triangles facing upwards) + 1 + 2 (triangles facing downwards = 6 triangles
Number of triangles with side 3 cm = 2 (a triangle facing upwards + a triangle facing downwards)

Summing them up, we have 20 triangles in total.