Answer:
8.16 or 6.06
Step-by-step explanation:
final is 3.96
they reduced their time twice by 2.1min
3.96+2.1+2. 1=8.16
1) would be 2 boxes because the room is 25 ft²
2) $99.50 if you do 25 x 3.98, or if they want 40 x 3.98 it would be $159.20
The length of pendulum is 2.485 feet
<h3><u><em>
Solution:</em></u></h3>
Given that,
The formula T= 2pi sqrt(L/32) relates the time, T, in seconds for a pendulum with the length, L, in feet, to make one full swing back and forth
<u><em>Therefore, the given formula is:</em></u>

We have to find the length of pendulum that makes one full swing in 1.75 seconds
So the modify the given equation to find "L"

Substitute T = 1.75 seconds and 

Thus length of pendulum is 2.485 feet approximately
Simply divide the numerator by the denominator.
258 / 300 = 0.86 (as a decimal)
Now, multiply the decimal by 100 to find the percent.
0.86 * 100 = 86%
Hope this helps!