The unknown is how many girls and boys are in the class.
Answer:

Step-by-step explanation:
As x approaches 10 from the right side, h(x) approaches 18.5 but never touches it.
Answer:
A and B
Step-by-step explanation:
This is correct on khan academy!
Answer:
1/32
Step-by-step explanation:
This could be written as 
1/2 x 1/2 x 1/2 x 1/2 x 1/2
= 1/32, or 0.03125.