Could someone me with this question

Give the equations of two different lines that are perpendicular to the line 3x + 4y = 7.

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?

Rewrite the following quadratic functions in intercept or factored form. show your work. f(x) = 3x^2 - 12