Answer:
495 combinations of 4 students can be selected.
Step-by-step explanation:
The order of the students in the sample is not important. So we use the combinations formula to solve this question.
Combinations formula:
is the number of different combinations of x objects from a set of n elements, given by the following formula.

How many combination of random samples of 4 students can be selected?
4 from a set of 12. So

495 combinations of 4 students can be selected.
Answer:
80 m/s
Step-by-step explanation:
Answer: My friend is correct.
Step-by-step explanation:
<em>Adding a negative is the same as subtracting a positive.</em>



Hope this helps! Have a great day!
Answer:
98
Step-by-step explanation:
by looking at the bottom the answer is 98