Answer:
18750
Step-by-step explanation:
 
        
             
        
        
        
Answer:
   A. D=sqrt( (x2-x1)^2+(y2-y1)^2 )
Step-by-step explanation:
The distance between two points is the root of the sum of the squares of the differences in their corresponding coordinates. The equation of choice A is the usual formulation.
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<em>Comment on answer choices</em>
Because the square of a number is the same as the square of its opposite, the formula in choice D is also correct.
 
        
             
        
        
        
Answer: velocity-time graph
Step-by-step explanation: The principle is that the slope of the line on a velocity-time graph reveals useful information about the acceleration of the object. If the acceleration is zero, then the slope is zero (i.e., a horizontal line). If the acceleration is positive, then the slope is positive (i.e., an upward sloping line).
 
        
             
        
        
        
Sorry I am a little late...
a = -2
b = -9
Here is how to solve the problem. 
First thing I did was multiply the first equation by -2 so that we can eliminate the the b. After you multiply it by -2, your new equation is -16a + 8b = -40. 
You leave the second equation alone and all you do is combine like terms. So -16a+5a is -11. And you eliminate the b. Then you're going to do -40+62 which is 22. So it's -11a=22 and then you have to solve for a. What I did was I multiplied the whole thing by minus to turn the a positive. So then it's 11a=-22. Pretty easy, the final step is to simplify. -22/11 is -2. ;D 
So there you have your first answer. 
a = -2 
Now we're going to use the first answer to help us find b. 
For the second equation, all you're going to do is plug in that a. 
5 (-2)-8b=62 
-10 - 8b = 62
Now we move the -10 to the other side...
-8b = 62 + 10 
-8b = 72
Multiply the whole thing by negative once again to turn the b positive.
Now we have 8b = -72 
The final step is to simplify. -72/11 = -9
b = -9 
Hope this makes sense! Also I had the same question on my test and I got it right. :)