What is the distance between (4, 3) and (7, 3)?

3 units

Step-by-step explanation:

Part A: For every four cups of red paint used to make the orange mixture, One cup of yellow paint is being used

Part B: She should add 1/4 (or 0.25) to every one cup of red paint because if it takes 4 cups of red paint to add one cup of yellow paint, you have to divide 1 by 4 and you get 0.25 which is also 1/4

Part C: If 6 cups of red paint cost $42, you have to divide 42 by 6 ro find the unit price. 42÷6= 7. One cup of red paint costs $7