What is six hundred five thousandths in decimal form?

Solve the system of equations. y= 2x y= x^2 - 15

How do you use the elimination method for this question? explain, because i really want to understand!

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