Can I please get some help here?

The following chart shows price and demand data for two goods, A and B: Price of A ............ Demand for good A .............................................. Price of B ....................... quantity demanded good B $4.00 25 units $8.00 40 units $400 34 units $12.00 32 units Questions: (a) Calculate the Cross Elasticity of demand between goods A and B..,.(4 marks) (b) What does Cross Elasticity tell economists? (2 marks) (c) What is the relationship between goods A and B? Please explain