Find an equation for the nth term of the arithmetic sequence.

a14 = -33, a15 = 9

Question

Find an equation for the nth term of the arithmetic sequence.

a14 = -33, a15 = 9

lasttccasey · Answer

Assuming the difference is the pattern, 42 is added to -33 to get 9 so 9 + 42 gives...$$a_{16} = 51$$

anonymous · Answer

an = 4 • -3^n + 1

 an = -3 • 4^n - 1

 an = -3 • 4^n

 an = 4 • -3^n

which of these will be the equation needed?

lasttccasey · Answer

None of those make sense.. any number to the 15th or 16th power will be massive.. Are you missing parenthesis or something?

anonymous · Answer

i am so sorry i mixed the answers up 
here are the correct options 

an = -579 + 42(n + 1)

 an = -579 + 42(n - 1)

 an = -579 - 42(n + 1)

 an = -579 - 42(n - 1)

mathstudent55 · Answer

Plug in 14 and 15 into the choices, and see which one gives you a14 = -33 and a15 = 9.