Answer: Hi the answer is A. The number of observations is 10
Step-by-step explanation:hope this helped
Answer:

Step-by-step explanation:
Using order of operations, the first thing to be calculated would be
.
That would turn our equation into this:

You can then calculate left-to-right as usual to get the answer 10.
Answer:
a=1/2b, 2a=b
Step-by-step explanation:
Since angle a is 1/2 the size of angle b, a=1/2b and b=2a. In order to get a numeral answer, you need the number of one of the angles.
Answer:
49
Step-by-step explanation:
cos(x)=31/47
x=cos^-1 (31/47)
Answer:
no
Step-by-step explanation: