The sixth grade class went to a Family Fun Center. Out of the 154 students, 85 played laser tag. A total of 80 students roller skated and 39 of those played laser tag.

Which expression is equivalent to? assume x > 0 and y > 0.

F(x)=x/2-2 and g(x)=2x^2+x-3 find (f+g)(x)

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