Bu using Pythagoras theorem
(x^2)+(21)^2=(75)^2
Therefore. 5625-441=(x)^2
X^2=5184
Therefore x=72
Third side length=72 units
Answer:
35
Step-by-step explanation:
<u>Equation given</u>: 
- S: distance fallen --> 1279 ft
- t: time taken for the distance fallen
<u>Solve</u>:

Thus it took <u>8 seconds</u> for the thing to fall from the top
Hope that helps!