Answer:
9x^2 + 2x - 4
Step-by-step explanation:
8x^2 + x^2 = 9x^2
4x - 2x = 2x
-2 - 2 = -4
b i think
E. 99.7%
Calculate each z-score.
z = (x − μ) / σ
z = (173 − 128) / 15
z = 3
z = (83 − 128) / 15
z = -3
You can use a z-score table, or use the empirical rule.
P(-3 < z < 3) = 99.7%.
E
Hope it helps!
