How to solve 2.1*10^2/8.4*10^5

Find the value. a. 0.003 b. 0.03 c. 0.3 d. 3

Solve each quadratic equation by factoring and using the zero product property. x^2 - 8x + 30 = 3x

Astudent draws two parabolas both parabolas cross the x axis at (-4,0) and (6,0) the y intercept of the first parabolas 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