Why is the x coordinate undefined in picture 1? It's not undefined anywhere else on the circle and is only undefined when the radius is 4.1... not when the radius is 4.2 or 4.
Please write an answer that makes me understand and not just know.
Please answer, you can take your time, I'm not in a hurry.
(I'll give brainiest)

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

50 people men and women were asked if they watched at least one sport on tv. 20 of the people surveyed are women, but only 9 of them watch at least one sport on tv. 16 of the men watch at least one sport on tv. make a a two-way table and a relative frequency table to represent the data.

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