Anwser both of (number 5 and 6)

1-for what value of x is line a parallel to line b 2-for what value of x is line a parallel to line b

For the rule of 78, for a 12-month period, the last term in the sequence is 12 and the series sums to 78. for an 10 month period, the last term is and the series sum is . for a 15 month period, the last term is and the series sum is . for a 20 month period, the last term is and the series sum is

Consider that lines b and c are parallel. what is the value of x? what is the measure of the smaller angle?