If this is all multiplication
145.8
Answer:

Step-by-step explanation:

Distribute 2 through the parentheses


Hope I helped!
Best regards! :D
Answer:
It appears to be substitution
Step-by-step explanation:
I think you are talking about system of equations
Answer:
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15...
The greatest common factor is 4.
28/32 / 4 = 7/8