By visual inspection, determine the best-fitting regression model for the data plot below.

If you shift the linear parent function, f(x)=x, up 13 units, what is the equation of the new function?

Identify the number 127 as a rational or irrational. explain

For problems 29 - 31 the graph of a quadratic function y=ax^2 + bx + c is shown. tell whether the discriminant of ax^2 + bx + c = 0 is positive, negative, or zero.