please give brief explanation thank you.

2. Express the price elasticity of demand in terms of the coefficients in (1). [6 points] 3. In(Y,). [6 points] 4. Commercial rental price (dollars/square foot/month) in Cambridge in that year. [6 points] 5. The average length of hair of individuals appearing in People magazine in that year. [6 points]1. Suppose the model of interest is Y;= Pot Pixuit PXz + u;, where E(u|X)=0 and E(u [X)=q2 and X1 and X, are uncorrelated in your sample. Will the bivariate regression of Y on X, have the same coefficient estimate and standard error for , as the multivariate regression of Y on X, and X2? [6 points]