7(8+ k) find the productmultiplying monomials

Use set buikder notation to represent the following set: {, -2, -1, 0}

Jacob signs up to work for 2 1/2 hours at the school carnival. if each work shift is 3/4 hour, how many shifts will jacob work? (i just want to double check : |, for anybody that responds! : )

Math i have no idea how to do a and b