Answer:
The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.
Step-by-step explanation:
We have that to find our 
level, that is the subtraction of 1 by the confidence interval divided by 2. So:
Now, we have to find z in the Ztable as such z has a pvalue of 
.
So it is z with a pvalue of 
, so 
Now, find the margin of error M as such
In which 
is the standard deviation of the population and n is the size of the sample.
In this quesstion:
So
The margin of error for a confidence interval for the population mean with a 90% confidence level is 0.53 hours.
Using the slope-intercept form, the slope is 3 3 . To find an equation that is parallel<span>to </span>y=3x−2 y<span> = 3 x - </span>2<span> , the slopes must be equal. Using the slope of the equation, find the </span>parallel line<span> using the point-slope formula. Find the value of b b using the formula for the equation of a </span>line<span>.</span>
Answer:
x² + 13x - 56
Step-by-step explanation:
(x+7) (3x-8)
3x² - 8x + 21x - 56
combine like terms;
x² + 13x - 56
I am thinking it might be 21 but i am not sure
I don't like algebra pretending to be geometry. These are supplementary angles, adding to 180 degrees, geometry done.
We'll assume the units on the 2 and 8 are degrees.
(x + 8) + (3x + 2) = 180
4x + 10 = 180
4x = 170
x = 170/4 = 85/2 = 42.5 degrees
The first angle is x+8 = 50.5 degrees
The second angle is 3x+2=129.5 degrees
