The last question is not shown but asks "what is the elasticity of demand of the ice-cream with respect to the local temperature

Problem 2. Suppose that the local demand for ice-cream is given by Qd = 60 - 10Pice + 5Ppop + 0.2T where Pice and Ppop are the price of ice-cream and Popsicle respectively, and T' is the local temper- ature (in Fahrenheit). a) Suppose that the price of Popsicle is $2 and the current temperature in the town is 70 degrees Fahrenheit. What is the demand curve for ice-cream? [Hint: what is the algebraic function for the ice-cream demand in terms of its own price?] b) What is the quantity demanded for ice-cream if ice-cream price is $5? c) What is the elasticity of demand wrt of price of ice-cream? [Use the above numbers for prices and temperature] Is ice-cream demand elastic or inelastic at the current price? d) What is the cross-price elasticity of demand of ice-cream with respect to the price of Popsicle