The common difference, d, can be determined by subtracting the two consecutive values:
1 - 5 = -4
-3 - 1 = -4
-7 - -3 = -4
Then, using the equation:
an = a1+ d(n-1)
a_21 = 5 + (-4)(21 - 1)
a_21 = -75
The answer is letter D. I hope I was able to help you. Have a good day!
Answer:
A
Step-by-step explanation:
By using the given pairs e.g (4,1 ) (8,6) on the graph plane
Are there any answer choices?
Well first do 36 divided by 4, which is 9, then square root 9 to make it 3, so your answer should be 3
