Answer:
. ....
Step-by-step explanation:
Answer:
1.77
Step-by-step explanation:
First option because 3 x 10^9 is 3,000,000,000
Alright First you combine the like terms.
9n - 3n = 6n
21 - 24 = -3
Rewrite the simplified equation
6n - 3 = 0
Solve for n
6n = 3
n = 3/6
n = 1/2
Ask if you need more help! :)