Can you help me with the following question in business economics.

2) The estimated demand for good X is given by Q=7000-10P-20P-0.11, where Pr is the price of good X, Py is the price of good Y, and I is average income. Suppose that PY = 5, Py = 4, and average consumer income is $10000. a) Calculate the income elasticity of demand! b) Calculate the cross-price elasticity of demand! c) Indicate whether goods Y are substitutes or complements for good X! d) Is X an inferior or a normal good? e) Determine the demand function and inverse demand function for good X. f) How many units of good X will be purchased when P=10