Answer:
16
Step-by-step explanation:
A = (√3)/4 x s²
s = 9
A = (√3)/4 x 9²
A = (√3)/4 x 81
A = (81√3)/4
Answer:
x≈-2.433 ,x≈2.15
Step-by-step explanation:

The account will have decreased by $2640 after 2/3 year.
The answer is 8.45498149331, you can round it to the nearest thousandths place though, too.