The equation: n - 4 = -15
Now let's solve our equation for n. 
n - 4 = -15
Add 4 to both sides.
n = -11
 
        
             
        
        
        
Answer:
3x^2+1
Step-by-step explanation:
 
        
             
        
        
        
I think the first one (hope it helps.
        
             
        
        
        
It is given in the question that cost of pork is $7.99/kg.
It means cost of 1 kg pork is $7.99.
Cost of 2 kg of pork is

And cost of 3 kg of pork is

Therefore cost of 3.5 kg of pork is

 
        
             
        
        
        
Answer:
a) The line intersects with the circle once.
b) Tangent
Step-by-step explanation:
We are given the following equation for the circle:

How many times does the line y=-6 intersect with the circle?
We have to find the values of x when 
So





Since the line intersects the circle at one point, it is tangent to the circle.
The line intersects with the circle once.