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.
5z>15-----subtract 2 on both sides
z>3----divide by 5
therefore, z must equal -10, or -4
To the nearest tenth = 4.4 and to the nearest whole number is 4. Whatever estimation it asks you.
Here is what the answer to your question is:
7x10x1=70
