2×5^{2} if you don't understand its 2 times 5 to the second power.
For this case we have the following equation:

Where,
w: The weight of a spring in pounds
E: the energy stored by the spring in joules.
Substituting values we have:

Making the corresponding calculation:
Answer:
the approximate weight of the spring in pounds is:
Answer: fifty-two hundredths
Step-by-step explanation:
Part. %
------ = -------
Whole 100
816. X
------- = ------
850. 100
850x=81600
-------- ---------
850. 850
X=96
96% of seats were sold
Answer:
B. One
Step-by-step explanation:
Since the two angles are already given, the value of the third angle is already fixed. The third angle can be found by the sum of both angles subtracted from 180. Since 2 angles and lengths are already given, there can only be 1 triangle.
Hope this helps!
If not, I am sorry.