Is this sequence arithmetic, geometric, or neither?
1 answer:
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Answer:
13 is the number.
Step-by-step explanation:
Given:
Twice the difference of a number and 9 equals 8.
Let the unknown number be 'x'.
Therefore, as per question:
The difference of 'x' and 9 =
Twice the difference means 2 times the difference. So, we multiply 2 to the difference. Therefore,
Now, the above expression is equal to 8. So, we equate the above expression to 8. This gives,
Solving for 'x', we get:
Using distributive property of addition and distributing 2 inside the bracket. This gives,
Therefore, the unknown number is 13.
Now, we can verify our answer.
Therefore, the answer is correct.
This is the simplest proportion i have seen.
This is how we do it:
= 
The answer surprisingly is obvious, z = 1
But we can still do cross multiplication
7z = 7
Divide by 7 to isolate z
7 and 7 cancels out
z = 1
This is how we do it:
The answer surprisingly is obvious, z = 1
But we can still do cross multiplication
7z = 7
Divide by 7 to isolate z
7 and 7 cancels out
z = 1