Assume that all the given functions have continuous second-order partial derivatives. if z = f(x, y), where x = 9r cos(θ) and y = 9r sin(θ), find the following: a) ∂z / ∂r b) ∂z / ∂θ c) ∂^2z / ∂r ∂θ

Problem situation: caren is making rice and beans. she can spend no more than $10 on ingredients. she buys one bag of rice for $4.99. beans cost $0.74 per pound. how many pounds of beans, x, can she buy? inequality that represents this situation: 10≥4.99+0.74x drag each number to show if it is a solution to both the inequality and the problem situation, to the inequality only, or if it is not a solution.