I first solve the difference of 20-x and 13+x that is equal to 7, then generate the equation (13+x)-(6x)=7 because it is the common difference and fins the value of x which is 2/5, therefore the common difference is 7 where x is equal to 2/5 to make the sequence arithmetic.
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the common difference is 7 where x=2/5
Step-by-step explanation:
I first solve the difference of 20-x and 13+x that is equal to 7, then generate the equation (13+x)-(6x)=7 because it is the common difference and fins the value of x which is 2/5, therefore the common difference is 7 where x is equal to 2/5 to make the sequence arithmetic.