A liquid in the lab has a volume of 50.0 milliliters and a mass of [a] grams. Determine its density to the correct number of significant digits. 

What is the name for the halogen in Period 4? 

Which of the following elements has the highest ionization energy? 

Find the sum of the following series. ∑ n = 3 ∞ 4 n 2 − 4 {“version”:”1.1″,”math”:”\sum\limits_{n=3}^\infty \frac{4}{n^2-4}”}

Categorize the type of cells with their associated vascular structures.

Which of the following correctly represents 324,000,000 written in scientific notation? 

(04.04 MC) Which is the equation of an ellipse with directrices at y = ±2 and foci at (0, 1) and (0, −1)?

(04.04 MC) A designer wants to create a whisper chamber in the shape of an ellipse. He has a warehouse space with a longest length of 50 yards, which he decides will be the major axis of his elliptical chamber. He determines the best spots for his guests to stand to experience his whisper chamber will be 10 yards from the center of the warehouse space, which will act as the foci. How far out from the center, along the minor axis should he build out his whisper chamber?

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

(04.04 MC) A designer wants to create a whisper chamber in the shape of an ellipse. He has a warehouse space with a longest length of 30 ft, which he decides will be the major axis of his elliptical chamber. He determines the best spots for his guests to stand to experience his whisper chamber will be 4 ft from the center of the warehouse space, which will act as the foci. How far out from the center, along the minor axis, should he build his whisper chamber?