When a math class took a test, 15% of the class failed, 25% made some mistakes (but didnt fail), and 24 students got perfect scors. how many students were in the class?

40

Step-by-step explanation:

60%=24

1%=1÷60×24

1%=0.4

100%=0.4×100

100%=40

Answer with explanation:

Equation of Parabola that opens Downward having vertex at (0,4) is given by:

It is also given that,  vertex of a second parabola is at (0, –4).

Also, it is given that Parabola Intersect at two points.

 So, the parabola must open upward to intersect at two points.

Equation of Parabola having vertex (0,-4) ,is given by:

It is not necessary that , point of intersection is on the x axis, the two parabolas can intersect anywhere.

Option B: The second parabola opens upward