Gisela has 135 CDs. Eleven are music. She has 3 times as many CDs as she has classical. How many rock CDs does Gisela have? A. 135, B. 124, C. 93, D. 31
Use the next formula to find the margin or error:
z is the critical value (For a 95% confidence level the z-score is 1.95998)
σ is the standard deviation
n is the sample size
<h2>Then the margin of error is: 6.6639</h2>
X² <span>+ 11x = -28
to find the solution of this polynomial, it'll be easiest to try and factor it. the first thing you need to do is move everything to one side:
</span>x² + 11x = -28 ... add 28
x² + 11x + 28 = 0 ... factor
(x + 7)(x + 4) = 0 ... now set both of your factors equal to zero and solve for x
x + 7 = 0
x = -7
x + 4 = 0
x = -4
