A and F are true. because A is y=2x+7, and F is y=2x+7. 
We know that the equation y=2x+7 has a point 0,7 and with the slope being 2, rise over run would make another point 1,9. And because these are linear equations if the equation y=2x+7 goes through 1,9 then it will go though -2,3 as well.
        
             
        
        
        
30% can also be written as .3, which is easier to use in this case. 
To find how many just sat around, multiply the number of people by the percentage of how many just sat around.
1400*.3=420
        
                    
             
        
        
        
Answer:  The speed of the motorboat is 70 miles per hour
Step-by-step explanation:  Subtract the initial distance, 35, from the distance at any given time, then divide the remainder by the hours.
For example, at 2 hours, the distance shown on the graph is 175 miles
Subtract: 175 -35 = 140.  Then divide 140/2 = 70
At 4 hours, the distance shown is 315 miles.
Subtract: 315 - 35 = 280. Then divide  280/4 = 70
70 mph is the speed.
 
        
             
        
        
        
Yes they are equal. 45 is a multiple of 15. 45/15=3, 7*3=21. so 21/45 is equal to 7/15.
        
             
        
        
        
Hopes this helps:
Answer: 48