She had $10 dollars and the 15 is far so you need to have only one estimate.
        
             
        
        
        
Answer: a) Q= 5units
b) R= $75
Step-by-step explanation:
The maximum revenue is at dR/dq = 0
Revenue = price x quantity of demand = p × q
Substituting p = 30- 3q
R = (30-3q) × q
R= 30q- 3q2 (q2 = q raised to the power of 2)
dR/dq = 30- 6q = 0 
6q = 30 
q= 30/6= 5
q= 5 units
R = pq= 30q- 3q2
R= 30(5) - 3( 5×5)
R= 150- 75
R= $75
Goodluck...
 
        
                    
             
        
        
        
3x-7+c=x^2+4x-1
find c
minus 3x from both sides
-7+c=x^2+x-1
add 7 to both sides
c=x^2+x+6
x^2+x+6 must be added
        
                    
             
        
        
        
 Answer:
|a|
Step-by-step explanation:
if a was negative, the distance would be -a or absolute value a ( can be written as |a| ).
if a was positive, distance would be a. can also be written as |a|
 
        
             
        
        
        
Answer: 990
Step-by-step explanation:
(18 x 21) + (3 x 18) + (21 x 18) + (2)(21x3) + (3 x 18) = 990