I do not know the answer to this question, could someone help me?

a) {-1, 4}

b) {-1, 1, 2, 3, 4, 5, 7, 8}

Step-by-step explanation:

a) The intersection of M and D is all values in M that are also in D. In this case, it is only -1 and 4.

{-1, 4}

b) The union of M and D are all of the distinct numbers in both of the sets.

{-1, 1, 2, 3, 4, 5, 7, 8}

answer: the answer is 127 degrees