For this case we have that by definition, the slope of a line is given by:

Two points are needed through which the line passes:

Substituting:
Rounding:

Answer:

The Aon Center is taller. You just need to look at the place values, like 5 and 10. Which is bigger? the ten of course.
C
6*3=18
6*8= 48 and 3*8=24
24*48= 1152
1152/18=64
204 902.0
124 510.0
Move the decimal point to the left, until you have a number less than 10.
204 902 = 2.04902 × 10⁵
124 510 = 1.2451 × 10⁵