Answer:
the number is 27
Step-by-step explanation:
7 - 2 = 5
72 ÷ 3 = 24
24 ÷ 8 = 3
 
        
             
        
        
        
Answer:
Ginny made a mistake in step 1 when she identified b = 31. It should be b=-31
Step-by-step explanation:
Ginny factored  as shown:
 as shown: 
ac = –180 and 
b = 31 
36(–5) = –180 and 36 + (–5) = 31 
 + 36x – 5x – 30
 + 36x – 5x – 30 
6x(x + 6) – 5(x + 6) 
(x + 6)(6x – 5)
b is the coefficient of x and from the trinomial  , b=-31.
, b=-31.
Therefore Ginny made a mistake in step 1 when she identified b = 31. It should be b = –31.
The correct steps are:  :
: 
ac = –180 and 
b = -31 
36(–5) = –180 and -36+5 = -31 
 
  


 
        
             
        
        
        
2x2 + x −#6 _____________
x2 − 1
 ∙ x
__
2 + 2x + 1
x 2 − 4
 Rewrite as multiplication.
(2x − 3)(x + 2) __
(x + 1)(x − 1) ∙ (x + 1)(x + 1) __ (x + 2)(x − 2) Factor the numerator and denominator.
(2x − 3)(x + 2)(x + 1)(x + 1) ___ (x + 1)(x − 1)(x + 2)(x − 2) Multiply numerators and denominators.
(2x − 3)(x + 2)(x + 1)(x + 1) ___ (x + 1)(x − 1)(x + 2)(x − 2) Cancel common factors to simplify.
(2x − 3)(x + 1) __ (x − 1)(x − 2) 
 
        
             
        
        
        
S=d/t
45=29/t
t=45/29
convert to min
t=45/29 *60=38.66min