Answer: the awnser is 33 3/4
Step-by-step explanation: im literally doing the same test
Just replace x^2+4 with a
factor out on left side
(x^2+4)^2+32=12(x^2+4)
replace x^2+4 with a
a^2+32=12a
minus 12a both sides
a^2-12a+32=0
solve
factor
what 2 numbers mulitply to get 32 and add to get -12
-4 and -8
(a-4)(a-8)=0
set each to zero
a-4=0
a=4
a-8=0
a=8
remember
a=x^2+4
so
4=x^2+4
0=x^2
0=x
8=x^2+4
4=x^2
+/-2=x
x=-2, 0, 2
Answer:c
Step-by-step explanation:
Did the test
Answer:
Whenever n increases we get std deviation of sample mean decreases.
Step-by-step explanation:
Given that ducation of the self-employed: according to a recent current population reports, the population distribution of number of years of education for self-employed individuals in the united states has a mean of 13.6 and a standard deviation of 3.0.
The central limit theorem says sample mean follows normal for randomly drawn samples of large sizes.
a) Hence X bar follows a normal with mean = 13.6
and std dev = std dev of sample/square root of sample size.
Hence std dev of x bar = 3/sqrt 100 = 0.3
b) when n =400 square root of n becomes double making the std dev of sample mean exactly 1/2
Hence new std dev = 3/sqrt 400 = 0.15
Whenever n increases we get std deviation of sample mean decreases.
Answer:
C
Step-by-step explanation:
domain starts from 6 and ends at 12
s is x axis and r is y axis
