Answer:
Option A - 
Step-by-step explanation:
We have given the expression 
We have to find the value of the expression ?
Solution :
Step 1 - Write the expression

Step 2 - Applying symbol rule i.e. multiplication of positive into negative is always negative, 

Step 3 - Solve

Therefore, The value of the expression is 
So, Option A is correct.
The statement on the bottom left is correct. (6 students studied for 20 to 24 hours)
Answer:
9
Step-by-step explanation:
Rewrite the whole numbers as multiplication.
(*excluding parentheses)