Answer:
-1/2 or x=2
Step-by-step explanation: The first step you need to do in getting your answer is factoring ,you will factor the left side of the equation first:
(2x+1)(x-2)=0
Next, you will set the factors to equal to "0":
2x+1=0  x-2=0
Then you'll proceed to solve the problem using the basic algebraic equation problem solving steps .When you do this you'll be left with answers of x=-1/2  and x=2 
 
        
             
        
        
        
Using an exponential function, it is found that f(5.5) = 19.8.
<h3>What is an exponential function?</h3>
An exponential function is a function in which the growth rate is a percentage, modeled by:

In which:
f(3.5) = 25 means that:


f(8.5) = 14 means that:

Hence:


![b = \sqrt[5]{\frac{14}{25}}](https://tex.z-dn.net/?f=b%20%3D%20%5Csqrt%5B5%5D%7B%5Cfrac%7B14%7D%7B25%7D%7D)


Hence, the function is given by:

Then, when x = 5.5:

More can be learned about exponential functions at brainly.com/question/25537936
 
        
             
        
        
        
Answer:
1.3125
Step-by-step explanation:
Given that our random variable  follows a Poisson distribution
 follows a Poisson distribution
Evaluate the formula at 

#since 

The mean and variance of the Poisson distributed random variable is equal to  :
:

#By property variance:

The expectation is 1.3125
 
        
             
        
        
        
7/x = 84 / (156 -x)
84x = 7(156 -x)
84x = 1092 - 7x
91x = 1092
 x = 12
AC = 156 - 12 = 144
answer
D. 144
        
             
        
        
        
Hey you can go on Gauthmath it will have more people online to help you