Answer:

Step-by-step explanation:

After removing one black marble:

Answer:
7.2 is your answer:)
Step-by-step explanation:
Answer:
14 square units
Step-by-step explanation:
For the last 2 questions,
1. 9/10
2. 7/12
Answer:
-8
Step-by-step explanation:
First combine like terms:
4x-8=32+9x
-40=5x
-8=x