Answer:
B.
Step-by-step explanation:
Missing xx:1 Missing y:5
Answer:
4*4=16+7=23
Step-by-step explanation:
Solving
we get 
Step-by-step explanation:
We need to find the value of a. We are given:

Solving:

So, Solving
we get 
Keywords: Solving Expressions
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The factors of 15 are 1, 3, 5 and 15. Now, as 1 is neither prime and nor a composite number (1 is not Prime because for a number to be a prime, it should have exact 2 factors i.e. 1 and itself, but 1 has only one factor. Therefore 1 is not prime.)
So the smallest prime factor of 15 is 3.
Hope this helped! :)