Given two points m and n on the coordinate plane, find the slope of mn and state the slope of the line perpendicular to mn

The verbal translation for the difference of m and 7 increased by 15

8000 + 8800 + 8000 + 8 million + 80 trillion + another a katrillion equals

Which of these numbers of simulations of an event would be most likely to produce results that are closest to those predicted by probability theory? 15, 20, 5, 10