Measure of angle a is 70.8 degrees. what is the compliment and supplement

Which point on the x-axis lies on the line that passes through point c and is parallel to lino ab?

Hell . what are the solutions to `10x^2 - 38x - 8 = 0`? is this when i find the factors and use the numbers within the factors to determine the zeros? i hope that made sense lol

An arithmetic series a consists of consecutive integers that are multiples of 4 what is the sum of the first 9 terms of this sequence if the first term is 0