Hello I did my math homework, but I need someone to check if I did it right or not.

1. A = z>=4 B = z<7

Write A or B and A and B using interval notation

Answer: A or B = (-infinity, infinity)
A and B = [4,7)

2. Write the algebraic expression for the following:
8 is less than or equal to b
Answer: 8=<b

3. Write the algebraic expresison for the following:
-3 is greater than or equal to x , and x is greater than -4
Answer: -3>=x>-4

4. |-4w + 8| = 28
Answer: -5.9

2 answers

typo # 4 answer = -5,9

All correct.