Please help me with solving only question (a) Provide the steps to get to the final solution, and interpret. THANKS a lot!

A large university keeps track of its students when they enter the labor market after leaving school. Specically, they collect data on their students' starting salaries [in thousands of US. dollars), gender, and whether the student graduated from a STEM (science, technology, engineering, maths) eld. These variables are denoted inc, male, and stem, respectively. The following model is then estimated using 0L3 inci = 30 + Elma-leg- + m. [1) (a) Take the expectation of equation [1) conditional on male = 1 and male = I} (one at a time). What is ,81 equal to? Hov.r do you interpret {31