Step-by-step explanation:
I can only answer part 2 of your question, "If we multiply two positive numbers, is the result positive or negative?". if you multiply 2 positive numbers your answer would be positive.
Answer:
3/2
slope=rise/run=30/20=3/2
B) 10g
Collect like terms
8g + 4g - 2g = 10g
2 - 2 = 0
10g + 0= 0