Two adjacent angles are on a straight line. One angle has a measure of ( 5x - 28 )° and the other angle has a measure of ( 8x )°. What is the measure of the second angle?
Since the two angles are adjacent and on a straight line, they add up to 180 degrees. We can set up the equation:
(5x - 28) + (8x) = 180
Combining like terms:
13x - 28 = 180
Adding 28 to both sides:
13x = 208
Dividing both sides by 13:
x = 16
Therefore, the second angle has a measure of:
8x = 8 * 16 = <<8*16=128>>128 degrees. Answer: \boxed{128}.