Word form - six.seven
Expand form - 6 + 0.7
        
             
        
        
        
Answer:
His score decreased by 9 percent this time. 
Step-by-step explanation:
From his first history exam he had a score of 90 percent. The difference between his first score and present score is given by
90 - 81 = 9
 
        
             
        
        
        
40 miles per hour. if you take 60 divided by 1.5(the speed over time) you get 40mph