-8(b+3). Please answer quick.

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

Astudent draws two parabolas on graph paper. both parabolas cross the x-axis at (–4, 0) and (6, 0). the y-intercept of the first parabola is (0, –12). the y-intercept of the second parabola is (0, –24). what is the positive difference between the a values for the two functions that describe the parabolas? write your answer as a decimal rounded to the nearest tenth

Y+ 2/y is it a polynomial in one variable or not? and if so, why?