-2x3= -6. Adding a negative number is just like subtracting it :)
Answer: 993.6
Step-by-step explanation:
height*base*depth=Area
8*6.9= 55.2
55.2*18= 993.6
Sorry if i gave you the wrong answer, I am super sorry
Read method 2 of the article to understand how to do it:
https://www.wikihow.com/Balance-Chemical-Equations