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!
The answer is A,Because its the third degree
Answer:x=-1
Step-by-step explanation:
Answer:
solved graphically,
it's just the point where the two lines intersect
