21 is the answer i think idk try dividing them all or finindng something or look up how to find a standard deviation
156 is even or odd number
Even number, it is divisible by 2
Answer:

Step-by-step explanation:

the number changes by the degree so you need to multiply it.
Answer:
its just 31^2=25^2 + b^2
Step-by-step explanation: