Which set of shapes can be arranged in 6 equal groups, with no shapes left
over?

The set of shapes that can be arranged in 6 equal groups is the first set or the set of triangles.

This task requires you to arrange or divide the shapes in equal groups of 6 and once the shapes are divided there can not be any shape leftover. Let's look at some examples:

The only set in which this occurs is the triangle set. This is because there are 12 triangles and 6 is a divisor of 12.

Note: This question is incomplete, below I attach the missing part.

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26?

step-by-step explanation:

f(x) has value 150 at x= 0

and 0 at x= 3

so d(f(x))/dt = slope = -150/3 = -50