Question

Identify the 42nd term of an arithmetic sequence where a1 = -12 and a27 = 66.

70
72
111
114

Answer 1

Is this urgent?

Answer 2

kind of yeah.

Answer 3

the quarter is ending soon and i have a few assignments that have a couple problems i just cant get...

Answer 4

Okay speed round. So there are 27-1=26 differences between a1 and a27. The difference between a1 and a27 is 66-(-12)=78. that means the n (the difference between each term in the sequence is 78/26=3.
Can you take it from here?

Answer 5

I will be back...

Answer 6

where do you get the -12?

Answer 7

Isn't that a1?