if you have a triangle with a exterior angle of 5x+12 and two interior angles of 3x-2 and 50 what is x

Is the open sentence 5x-2=3x+2 true when x=2? justify your answer.

Which is the equation of an ellipse with directrices at x = ±4 and foci at (2, 0) and (−2, 0)?

(! ) three cylinders have a height of 8 cm. cylinder 1 has a radius of 1 cm. cylinder 2 has a radius of 2 cm. cylinder 3 has a radius of 3 cm. find the volume of each cylinder