Show solution to the inequality -2x≤1?

Which of the following is true for the relation f(x)=2x^2+1

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?

Binh says the point of intersections is (0,-3) which statements identify the errors binh made , check all that apply