as you already know we'll be using the conjugate of -1-√(27), which is just -1 + √(27), so we can rationalize the denominator.

Answer:
-38
Step-by-step explanation:
(-21 + -24 + -37 + -52 + - 56)/5 = -38
2a + 4 - 7a + a
2a -7a +a +4
-5a + a +4
-4a + 4
-4a + 4 is your answer
hope this helps