Answer:
a <= 3
Step-by-step explanation:
Yes it is. Input the numbers into the pythagorean theorem,

and if they equal each other it is a right triangle.
Answer:
X=45
Step-by-step explanation:
X=180-[60+75]=45
The length of a pendulum that makes one full swing in 1.9 s is about 2.926 which is about 3ft when rounded to the nearest foot