Solve the following systems.
8x -2y = -16
y = 8 + 4x
and
7x - y = 2
-7x + y = 2​

Find the center and the radius of the circle with the equation: x^2-2x+y^2+4y+1=0?

One hectometer is a) 1/1000 of a meter. b) 1/100 of a meter. c) 10 meters. d) 100 meters. e) 1000 meters.

60 musicians applied for a job at a music school. 14 of the musicians play both guitar and drums, 28 play drums, 18 play the guitar. what is the probability that the applicant who gets the job plays drums or guitar?