PLS HELP FROM 4 THROUGH 9 I BEG U PLEASE

The $x$-intercepts of the parabola $y = x^2 + bx + c$ are $(-3,0)$ and $(5,0).$ find the equation of the parabola, and submit your answer in $y = ax^2 + bx + c$ form.

Standard deviation of 19,29,21,22,23

Landon wrote that 3−2.6=4. which statement about his answer is true?