Answer:
Mrs. McCarr buys 90 markers 
Step-by-step explanation:
 
10 markers per package × 9 packages of markers = 90 markers in total
 
        
                    
             
        
        
        
Total number of hours she schduled to play the game = 3 hours.
 hours.
Let us convert mixed fraction into improper fraction

Duration of each round =  .
.
In order to find the number of rounds Nicole can play, we need to divide total number of hours by duration of each round.
 ÷
 ÷ 
Converting division sign into multiplication flips the second fraction.

Crossing out 12 by 4, we get 3 on the top of second fraction.


Because problem is about number of rounds.
So, total number of round would be 5.
 
        
                    
             
        
        
        
First find the slope of the line = (y2 - y1) / (x2 - x1)   where the 2 points are (x1, y1 and (x2, t2). 
Then  substitute the values of  the slope (m) and one of the points   into the point-slope formula
y - y1 = m(x - x1)
        
             
        
        
        
Factored form: (x-5)(7x+5) ☺
        
             
        
        
        
Answer:
4 hours
Step-by-step explanation:
First we need to subtract the one pay fee (the helmet rental fee, $15)
So 51 - 15 = 36
Then we need to divide 36 by the amount of money it costs for each hours to find how many hours he rented the bike
So 39/9 = 4