For this case we can raise a rule of three based on Anthony trotting 
miles in 23 minutes.
miles -----------> 23 minutes
x ----------------------------------------> 1minute
ANswer:
0.5 miles per minute
5(-3x-7) (first multiply 5 to -3x then to -7)
-15x-35.
The answer is D) -15x-35
I graphed it out and it seems that both A and C are correct. I would check them to make sure.
1)
8² + 15² = 17²
64 + 225 = 289
This is true, so the triangle is a right triangle.
2)
4² + 12² = 13²
16 + 144 = 169
This is false, so the triangle is not a right triangle.
3)
20² + 21² = 27²
400 + 441 = 729
This is false, so the triangle is not a right triangle.
4)
28² + 45² = 53²
784 + 2,025 = 2,809
This is true, so the triangle is a right triangle.
