Answer:
b
Step-by-step explanation:
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Answer:
[see below]
Step-by-step explanation:
Hope this helps.
21 is a rational number because it is an integer, which can be converted into a fraction.
<u>Step-by-step explanation:</u>
When a denominater and numerator are integers and gives a quotient then it is a rational number.
21/1, where 21 is denominator and 1 is numerator the quotient is 21. Therefore 21 is a rational number which can also be considered as a ratio.
common difference=d=43-39=4
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