Looking at the chart you see that the initial term is -1 and each successive term is 1 more than the previous one. The rule for nth term of an arithmetic sequence is:
a(n)=a+d(n-1), a(n)=nth term, a=initial term, d=common difference, n=term number.
In this case a=-1 and d=1 so
a(n)=-1+1(n-1)
a(n)=-1+n-1
a(n)=n-2
So the correct answer is A)
Answer:
90miles divided by 18 miles is 5 gallons
4/5 = 8/10
I slice of pizza
9/10-8/10 = 1/10
Work:
6/15 = x/1
To get from 15 to 1, you have to divide by 15. So, to make an equal field, divide 6 by 15.
6 : 15 is the same as 2 : 5 or 0.4.
30/80 = x/1
To get from 80 to 1, you have to divide by 80. So, to make an equal field, divide 30 by 80.
30 : 80 is the same as 3 : 8 or .875.
Comparing the two, 30 : 80 is greater than 6 : 15.
Hope this helps. Have a good day.