PLS HELP WILL GIVE BRAINLIEST

Which of the following constants can be added to x2 - 3x to form a perfect square trinomial?

2and 3 are angles. complementary vertical congruent supplementary

4. jake needs to score in the top 10% in order to earn a physical fitness certificate. the class mean is 78 and the standard deviation is 5.5. what raw score does he need? z value for top 10% =1.282 how do i get the z value? what is the equation for this? raw score =mean+z*sd = 78+1.282*5.5 = 85.051