Pls pls pls hel I will give brainiest to correct answer Determine the possible values of a for which x+ax+20 will factor.

In triangle △abc, ∠abc=90°, bh is an altitude. find the missing lengths. ab=9, and ac=12, find hc.

Consider the line y = -3/-2 x +6. find the equation of the line that is perpendicular to this line and passes through the point (-9,-3). find the equation of the line that is parallel to this line and passes through the point (-9,-3).

Find the roots of the equation below. x^2 - 6 + 9 = 0