4B is the wrong answer

A multiple regression includes two regressors: Yi=0+1X1i+2X2i+ui Use the tool palette to the right to answer the following questions. What is the expected change in Y if X1 increases by 4 units and X2 is unchanged? The expected change in Y if X1 increases by 4 units and X2 is unchanged is (Properly format your expression using the tools in the palette. Hover over tools to see keyboard shortcuts. E.g., a subscript can be created with the _character.)