What are the factor of 12 but not a multiple of 4

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

Acircle has a circumference of 7.850 units. what is its radius?

The customer price index(cpi), which measures the cost of a typical package of customer goods,was 208.8 in 2011 and 244.1 in 2016.let x=11 corresponding to the year 2011 an estimate to cpi into 2013 and 2014. assume that the data can be modeled by a straight line and the trend to continue idenfinitely.use data points to find such a line and then estimate the requested quantities