1. Over the quarantine, I spent a lot of time growing plants and working out. Let's say that we can describe how happy someone is based on the amount of time spent on each of these activities, and we can calculate it based on the function h(x,y) = -ry? - yr +20ry + 30 where r is the number of hours spent gardening and y is the number of hours spent working out. (a) What are the physical interpretations of Oh/Or and Oh/dy? (b) Find the critical points of h(x, y). Classify each of these critical points. (c) Now, let's say I only had three hours of free time to spend on these activities. How much time should I spend on each activity? Only consider the points where I am spending positive amounts of time on each