Question

I need help is it A B C or D

Answer 1

The question is asking you to solve for A

to determine the first, fourth and tenth term you simply put those values in for (n) 

the first term you then be given by the equation A(1) = 12 + ((1)-1)(3) 

A= 12 

Same thing for 4th term A(4) = 12 + ((4)-1)(3)

A= 21

10th term: A(10) = 12 + ((10)-1)(3)

A= 39 


∴ your answer is C