Is this a linear function?

Yes

Step-by-step explanation:

The rate of change ( the slope) of consecutive points are constant.

Using the slope formula on consecutive points

m = (y₂ - y₁ ) / (x₂ - x₁ ), then

=

=

=

Thus the given data represents a linear function

  21.3

step-by-step explanation:

multiplying the given equation by c/sin(25°), we get

  c = 9/sin(25°) ≈ 21.2958 ≈ 21.3

we assume "c" is the length of ab, the side opposite angle c in triangle abc.

one set of data has more variation than the other. hope this !