\( \Rightarrow \begin{array}{l}\sqrt{\mathrm{x}+1+\mathrm{x}} \\ \text { Derivar por definición }\end{array} \)

15) \( \frac{11 u^{4}}{17 u^{7} v^{9}} \)

Simplify each expression, assuming that no variable equals zero. Write your answer with positive exponents only. \( \begin{array}{llll}\text { 39. } y^{5} y^{2} & \text { 40. }-2 z^{3} z^{5} & \text { 41. }-2 y^{3}\left(5 x y^{4}\right) & \text { 42. } 6 x^{5} \cdot 3 x^{5} \cdot x^{0} \\ \text { 43. } \frac{m^{9}}{m^{5}} & \text { 44. } \frac{b b^{4}}{b^{2}} & \text { 45. } \frac{x^{2} x^{-5}}{x^{4}} & \text { 46. } \frac{s^{5} t^{2}}{s t^{-4}} \\ \text { 47. }\left(2 x^{4} y\right)^{3} & \text { 48. }\left(3 s t^{12}\right)^{3} & \text { 49. }\left(-5 w^{4} v^{5}\right)^{2} & \text { 50. }\left(-3 x^{2} y^{7}\right)^{3} \\ \text { 51. }\left(\frac{-2 z^{2}}{x^{3}}\right)^{7} & \text { 52. }\left(\frac{2 b^{4}}{-a^{2}}\right)^{3} & \text { 53. }\left(\frac{-2 p^{5} q^{-4}}{q^{3}}\right)^{3} & \text { 54. }\left(\frac{3 m^{2} n^{3}}{m^{-1}}\right)^{5}\end{array} \)

Decide whether or not the equation has a circle as its graph. If it does, give the center and the radius. If it does not, describe the graph. \( x^{2}+y^{2}+6 x-8 y+34=0 \) Select the correct choice below and, if necessary, fill in the answer boxes to complete your choice. A. The graph of the equation is a line. B. The graph of the equation is a point. C. The graph of the equation is a circle with center The radius of the circle is D. The graph is nonexistent.

What is the benefit of the plasma membrane being selectively permeable? It allows any substance through the membrane, ensuring that the cell has all the nutrients it requires. It guarantees that the cell will not grow so much that it ruptures. invading pathogens from infecting the cell.

What is the main method of transporting glucose and amino acids through the plasma membrane? Endocytosis Facilitated transport