Answer:
4845 ways
Step-by-step explanation:
To solve this problem we use the formula of combinations

Where n is the total number of students that can be chosen and you choose r from them.
So

Note that in this case the order in which the 4 students are chosen does not matter.
Then


Answer:
The Area = 28.26 or 28.27 depends if you round or not
Answer:
(x/12)+15
Step-by-step explanation: