67 plus 9999999999999999999999999999999

In the proof of the triangle angle sum theorem, you must draw an auxiliary line. which construction must you use to draw this line?

Write an algebraic expression to match each statement a. four less than 8 times a number b. twice the difference of a number and six c. nine from a number squared

What statement is true? 2x^2-9x+2=-1