Beth solved the system of equations by making a substitution for y in the second equation. what equation did she get as a result of that substitution? y = 4x – 11 3x + 5y = –9 12x – 11 = –9 12x – 55 = –9 3x + 20x – 55 = –9 3x + 20x – 11 = –9

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

If the speed of an electromagnetic wave is 100,000 cm/s and its wavelength is 100 cm, what is its frequency? a) 100,000 cycles per second (hz) b) 1 × 10-3 cycles per second (hz) c) 10,000,000 cycles per second (hz) d) 1,000 cycles per second (hz)

Sandy is ordering bread rolls for her party,she wants 3/5 of the rolls to be whole wheat. what other factions can represent part of the rolls that will be whole wheat? shade the models to show your work.