Can someone explain to me how to do these in

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?

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.

Which statement best describes how to determine whether f(x) = x squared- x +8 is an even function ?