How to find the answer of passes through (8,-4), slope=1/2

i believe your answer is 99.7% of 7-year-old children are between 46.6 inches and 49.5 inches tall.

the image is given below

since the options are not given so we draw it from the equation

the given equation is

y = (x-1) (x+4)

y = y² + 3x - 4

the above equation is a quadratic equation which will have two roots. if we draw the graph for it, it will look like this