Complete the table by providing justification for each step of the proof. conjecture: if 4(x2 – 2) = 28, then x is 3 or –3

Planning for the possibility that your home might get struck by lighting and catch on fire is part of a plan for ?

Ineed to know the answer to this algebra question.

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?