Celestial object A is composed of 92.1 percent hydrogen and 7.8 percent helium while celestial object \( B \) is made up of ice, frozen carbon dioxide, rock, and dust. What is celestial object A? A. asteroid B. comet C. dwart planet D. black hole E. star

3. Sea \( A=\left(\begin{array}{lll}3 & k & 0 \\ 0 & 0 & 0 \\ 0 & 1 & 1\end{array}\right) \in \mathbb{R}^{3 \times 3} \). (a) Hallar todos \( \operatorname{los} k \in \mathbb{R} \) para que \( A \) sea diagonalizable. (b) Hallar todos los \( k \in \mathbb{R} \) para que \( (1,-1,1) \) sea autovector de \( A \).

Explain the differences between repurposing, reusing, and recycling. Give an example of how you could do 2 of these.

With a minimum of computations, use only a simple calculator and cofactor expansions to find the determinant of the matrix, \( M=\left[\begin{array}{cccc}-6 & 0 & 0 & -7 \\ -6 & -1 & 6 & 8 \\ 5 & 0 & 0 & 0 \\ -4 & -4 & -7 & -4\end{array}\right] \)

One of the dominant features of Renaissance thought was a(n) study of ancient Greek and Roman culture. distrust of all government and political authority. hostility to all forms of Christian religion. admiration for Chinese philosophy.

What are common symptoms of major depressive disorder? Intense and irrational fear of everyday situations. Frequent fluctuations between extreme happiness and sadness. Persistent feelings of sadness, a lack of interest in enjoyable activities, and significant weight changes. Increased energy, reduced need for sleep, and hyperactivity.