1.
x^2 + 11x + n
=x^2 + 2 (x)(11/2) + (11/2)^2
= x + 11/2)^2
answer : n = (11/2)^2 = 121/4 = 30.25 (third choice)
2.
x^2 + 6x + 5 = 0
(x+5)(x+1) = 0
x = -5 and x = -1
answer: x = -1 (second choice)
4. V = whl
answer w=8 second choice
double check
V = whl
2720 = 8 (17)(20)
2720 = 2720