Answer:
to be honest I don't know either, but it's probably C
Answer:
n=31.5
Step-by-step explanation:
The given question is:

Cross multiply to get:

Expand the parenthesis:

Group similar terms:

Combine the like terms

Divide both sides by 4

n=31.5
Answer:
BD
Because it is straight line segment that passes through center from one point in circumference to other
Since most of these are mixed number you have to convert them into improper fractions.
For an example 2 3/4 x 1/2
First you would have the convert 2 3/4
You would add 2 to 3 then multiply 2 to 4
So it would be (2x4) + 3
You keep the denominator of the originally fraction so it would be 11/4
Then to finish you would multiply straight across so
11x1= 11
4x2=8
11/8
1 3/8
Hope this helps!!