Answer:
A
Step-by-step explanation:
Multiply the number by every element of the matrix. Answer: A
Answer:
D
Step-by-step explanation:
I think it's 112 I did it in my head might be wrong
The first step would be to add 7 to both sides.
3n-7=30
add 7
3n=37
divide by 3
n=12.33