What is the value of a in the equation 4a+2=14

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

anyone? find the second, fifth, and ninth terms of a sequence where the first term is 65 and the common difference is -7. 72, 93, 121 72, 79, 86 58, 37, 9 58, 51, 44

What is the difference between the equations of a vertical and a horizontal line?