Can someone find what x please?

5x + 14 = 614

In which figure is de bc ? a. figure 1 b. figure 2 c. figure 3 d. figure 4

Which is equivalent to 10/12? options: 10/18 5/6 3/12 9/11

The measure of one angle of an octagon is two times smaller that of the other seven angles. what is the measure of each angle?