The difference between two numbers are
and numbers are
and
so the equation is 
How to find the equation and what is the equation ?
equation, statement of equality between two expressions consisting of variables and/or numbers. In essence, equations are questions, and the development of mathematics has been driven by attempts to find answers to those questions in a systematic way.
if the difference of two numbers are 
And one number is
and another is 
So we write the equation with operation of subtraction

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It subtracts 2 then adds 5
Answer:
C
Step-by-step explanation: The rule is you add 1 more each numer. Continuing this it would be 15,21,28, etc.
Answer:
120
Step-by-step explanation: