Step-by-step explanation:
By substituting x = 0.4 in equation 7 + (-3x^2)
= 7 - 3 (0.4)^2
First solving o.4^2 as per the rule of BODMAS
= 7- 3 (0.16)
Now multiplying -3 with 0.16
= 7 - 0.48
= 6.52 THIS IS THE ANSWER
 
        
             
        
        
        
Answer:
C = 2πr
Step-by-step explanation:
We know that, the perimeter of a figure is equal to the sum of all sides.
A circle having no sides.
The perimeter of a circle = The circumference of the circle
The formula for the circumference of the circle is given by :
C = 2πr
Where
r is the radius of the circle
Hence, this is the required solution.
 
        
             
        
        
        
Answer:
please mark me brainlist 
Step-by-step explanation:
i need it
 
        
             
        
        
        
Please clarify, is it f(x)=2 to solve it?
        
             
        
        
        
Answer:
1. true
2. False
3. False
4. True
Step-by-step explanation: