Right away we know we don't have fractions; the midpoint is the average of the coordinates, so if it and one endpoint are integers so is the other endpoint.
We can do a kind of point arithmetic:
C = (A+B)/2
2C = A+B
B = 2C - A
B = 2(6,1) - (1,3) = (12,2)-(1,3)=(11,-1)
Answer: That's none of the above, but a typo away from the first choice.
A. d=45t
b. 112.5 miles. 112.5=45•2.5
The length is 7 and the width is 3
An=-5n+260
A40=60
So the Awnser is 60
(Hope this helped!!)
He sold 12 coins, 16+28+32+4=80. 15% of 80 is 12
