I think the answer is A. (7)(5x)(10)
        
             
        
        
        
Answer:
3.8
Step-by-step explanation:

Let's add 5x to both sides of the equation...

Then, let's add 75 to both sides of the equation...

Divide by the coefficient of x, (35)...

 
        
             
        
        
        
Answer: The functions values are greater than 0 over the interval.
Step-by-step explanation:
To tell if a function is positive over a given interval, see if it's below the x-axis or if it's under (since the x-axis represents 0). 
- If it's below, it's less than zero. 
- If it is above, it's greater than zero.
If the interval is above the x-axis, it's positive (greater), and if it's below, it's negative (less). 
 
        
             
        
        
        
Hope this helps good luck have fun
 
        
        
        
Divide 30 by 10. 30mph/10seconds = 3mph/seconds