Answer: X = 1/4 or X = -1
Step-by-step explanation:
4x2+3x−1=0
(4x−1)(x+1)=0
4x−1=0 or x+1=0
4x=1 or x=-1
Now divide 4 from both sides
like this 4x/4=1/4 
now cancel out two 4's so the answer will be x=1/4
 
        
             
        
        
        
100 - 80 = 20%
She ran 20% of the journey
20% x 9km = 0.2 x 9 = 1.8 km
Answer: She ran 1.8 km
 
        
             
        
        
        
Answer:
w=4     W=8
Step-by-step explanation:
 
        
             
        
        
        
Answer:
Domain = 1 to 7
Range = 4 to 28
Step-by-step explanation:
Given that:
Number of wheels used is a function of number of cars manufactured.
Number of wheels present = 28
1 car uses 4 wheels
2 cars use 8 wheels.
3 car uses 12 wheels
and so on.
Let the function be of the form: 

Domain of the function is the value of  that can be given as valid input to the function.
 that can be given as valid input to the function.
Range of the function is the value of  that can be output of the function.
 that can be output of the function.
Let  be the number of cars manufactured.
 be the number of cars manufactured.
Then value of  is nothing but
 is nothing but  times 4.
 times 4.

We are given that maximum value of  can be 28.
 can be 28.

Therefore, maximum value of input can be 7.
Minimum number of wheels can be 4 to make a minimum of 1 car.
Therefore domain is 4 to 28 and range is 1 to 7.