Answer:
nth term = 7n - 2
Step-by-step explanation:
a = first term = 5
d = common difference = second term - first term
= 12 - 5 =7
d = 7
a + (n-1)d
= 5 + (n -1)7
= 5 + 7n - 7 {add like terms}
= 7n - 2
n_n = n_n-1 + 7
All it does is it adds 7 to the previous term
n = n_(previous)+7
Answer:b2254
3x - 4 =9
divide the entire equation by 3
9x/3 - 12/3 = 36/3
3x - 4 = 9