Which of the following ate factors of t^4-81

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

On saturday a souvenir shop had 125 customers.sixty four percent of the costumers paid with a credit card. how many costumers paid with cash?

How many triangles can be drawn with side lengths 4 centimeters, 4.5 centimeters, and 9 centimeters? explain