Find the exact value.
cos225°

Acircle has a radius of 5/6 units and is centered at (3.6, 7.8) write the equation of this circle

Find the commission on a $590.00 sale if the commission is 15%.

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