i just got a screenshot of this hopefully this helps :)
For a direct variation, f(x) = kx. Therefore, for f(x) = 30x, constant of variation (k) = 30.
Answer:

Step-by-step explanation:
In the given right triangle,
Measure of angle = x°
Opposite side of the angle = 12 units
Adjacent side of the angle = 6 units
By taking tangent ratio of the given angle,
tan(x°) = 
= 
= 2



45. Using order of operations.
You can tell that a fraction is a unit fraction when it is over a unit of one. This is also known as unit rate.