What times what equals 63

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

Tim's phone service charges $26.39 plus an additional $0.21 for each text message sent per month. if tim's phone bill was $31.64, which equation could be used to find how many text messages, x, tim sent last month?

Anyone? 15m is what percent of 60m; 3m; 30m; 1.5 km?