How to solve 4k-1.5k=50

Factorize: x^2+8x+10 i just solved it but i don't know if the process is correct

Angle xyz is formed by segments xy and yz on the coordinate grid below: a coordinate plane is shown. angle xyz has endpoints at 3 comma negative 1 and 6 negative 2 and 3 comma negative 3 and measures 36.87 degrees. angle xyz is rotated 270 degrees counterclockwise about the origin to form angle x′y′z′. which statement shows the measure of angle x′y′z′?

M.xyz =radians. covert this radian measure to its equivalent measure in degrees.