Answer:
3
Step-by-step explanation:
Using listing:


No other factors are possible.
Hence, 1, 3, 7 and 21 are factors of 21.
2x - 10 = 30
2x = 40
x = 20
Answer:
4
Step-by-step explanation:
60/15=4
Answer:bdbdbd
Step-by-step explanation:
I am not sure
Answer:
x8 = 21 and x9 = 34
Step-by-step explanation:
The Fibonacci numbers are
1, 1, 2, 3, 5, 8, 13, 21, 34, 55, 89,...