Final answer:
The question involves drawing diagrams to illustrate percentage changes in the usage of flour and milk by a bakery, with a 40% increase and a 75% decrease, respectively.
Step-by-step explanation:
The student's question revolves around drawing diagrams to represent percentage changes in the amounts of flour and milk used by a bakery.
To address part a, depicting a 40% increase in flour use, we would start with a baseline quantity and then create a bar that is 40% taller to show the new amount.
For part b, showing a 75% decrease in milk use, we'd again start with an original quantity and then create a bar that represents only 25% of the initial height, effectively illustrating the reduction.