Help, extra pts and briniest <333333

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 statements are true about additional information for proving that the triangles are congruent check all that apply

Which equation can be solved to find x the measure of jk in the apex