You guys gotta help me i'm so confused

The pyramid below was dissected by a horizontal plane which shape describes the pyramid horizontal cross section

Margie is practicing for an upcoming tennis tournament. her first serve is good 20 out of 30 times on average. margie wants to know the estimated probability that her first serve will be good at least four of the next six times she serves. how could she design a simulation for this scenario?

What is the slope of the line passing through the points (-5, 7) and (-3,5)?