They didn’t use a ruler I think they made their own materials from what they had. Also thank you.
 
        
                    
             
        
        
        
Answer:
0.7 hours
Step-by-step explanation:
Given that Irina was able to make the same distance from work to home in 0.4 of an hour at 27 miles per hour, we can use this rate and time to find the distance she travels to and from work using the general formula: 
d = rt, where d=distance, r = rate and t = time
d = 27(0.4) = 10.8 miles 
Since the distance from Irina's home to work is 10.8 miles, we can again use the formula 'd = rt' to find the time it takes her to bike to work at a rate of 16 miles per hour and solving for time, 't': 
10.8 = (16)t 
t = 0.7 hours
 
        
             
        
        
        
Answer:
3 times (3x)
Step-by-step explanation:
Sandra raised 15 dollars.
Nita raised 45
45 divided by 15 is 3
3 * 15 = 45
 
        
             
        
        
        
Must be 16 and 21 because we can see 
30 and 70 has 10 as factor
24 and 44 has 2 as factor
12 and 30 has 2 as factor and all those factors are greater than one
        
                    
             
        
        
        
Answer: 5.7 x 107 
Step-by-step explanation: