Answer:
4/5
Explanation:
0.6
The rate of change is the slope m of the straight line
Calculate m using the slope formula
m = (y₂ - y₁ ) / (x₂ - x₁ )
with (x₁, y₁ ) = (0, 20) and (x₂, y₂ ) = (20, 32) ← 2 points on the line
m = = = 0.6
7.4m questions
9.9m answers
= 
= 0.6