La tercera parte del dinero que tiene Patty disminuida en S/. 20, es como mínimo 82 ¿Cuánto dinero como mínimo tiene Patty? Ayuda porfiss

The number of possible solutions of a polynomial can be found by looking

The distribution of the amount of money spent by students for textbooks in a semester is approximately normal in shape with a mean of $235 and a standard deviation of $20. according to the standard deviation rule, how much did almost all (99.7%) of the students spend on textbooks in a semester?

Which best explains why this triangle is or is not a right triangle ?