Answer:
I don’t knw but this is an answer
Step-by-step explanation:
You're meant to make one side of the equation equal 0.
For example, the first problem is

+ 9k = -7
You'd add 7 to both sides, leaving you with

+ 9k +7 =0
And I assume you know how to factor??
Answer:
See explanation. I added a photo and tried to explain everything. Please tell me in the comments if I explained it well and if handwriting was ok :)
Step-by-step explanation:
Answer: 2.43m^3
Step-by-step explanation: