Angle D = 47’
Angle B = 116’
32 + 32 = 64
180 - 64 = 116’
Angle E = 17’
116 + 47 = 163
180 - 163 = 17
Idk what to do after wards
305/0.305 = 1000
There are 1000ft in 305m.
Answer:Its O.x^2-4x-21
Step-by-step explanation:
(x-7)(x+3)we multiplie one value with anothet in different brackets and we get x^2+3x-7x-21,add same constant with x and u get .O
Answer:
A sample of at least 68 bulbs is needed to be 96% confident that our sample mean will be within 10 hours of the true mean.
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 M as such

In which
is the standard deviation of the population and n is the size of the sample.
In this problem, we have that:






A sample of at least 68 bulbs is needed to be 96% confident that our sample mean will be within 10 hours of the true mean.