Identify the center, the vertices, and the foci of the ellipses:

4x^2+y^2−16x−6y+21=0

Janet is mixing a 15% glucose solution with a 35% glucose solution. this mixture produces 35 liters of a 19% glucose solution. how many liters of the 15% solution is januet using in the mixture? a. 25 liters c. 28 liters b. 7 liters d. 10 liters

In the figure dhg fhe which statement is true by cpctc

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angles. measure need asap