I think it is B)Observational studies involve the random selection of subjects.
x= -3/8
here's how you solve it!
first distribute the -2/3 into the parentheses and you'll get:
4-8/3x+6=11
Then add 4 and 6 together
10-8/3x=11
Then multiply the equation by 3
30-8x=33
Then move the constant to the other side and change the sign
-8x=33-30
Subtract 30 from 33
-8x=3
Then divide both sides by -8
x=-3/8
Then you are left with your answer:
x= -3/8
Hope this helps! :3
Here you go :) I sent the work in the picture below
Given:
The graph of a function 
.
To find:
The interval where 
.
Solution:
From the given graph graph it is clear that, the function before x=0 and after x=3.6 lies above the x-axis. So, for 
and 
.
The function between x=0 and x=3.6 lies below the x-axis. So, 
for 
.
Now,
For 
, the graph of h(x) is above the x-axis. So, .
For 
, the graph of h(x) is below the x-axis. So, .
For 
, the graph of h(x) is below the x-axis. So, .
Only for the interval , we get .
Therefore, the correct option is A.
