Answer: 18°F
Step-by-step explanation: if you add 21 and -3 you get 18
The arithmetic sequence with the given condition is determined recursively by

So we have



and so on with the general pattern

This means the 72nd term in the sequence is

so the answer is B.
Answer:
5 friends
Step-by-step explanation:
Since the snacks are worth $25, it is deducted from the total
10x=75-25
10x=50
x=5