Question

Question is 12b as shown in the image:

​

Answer 1

`an = a1 + (n - 1)d \\ an = 3 + (n - 1)7 \\ an = 3 + 7n - 7 \\an = 7n - 4 \\ when \: \: n = 150 \\ a150 = 7(150) - 4 \\ 1050 - 4 \\ a150 = 1046`