1) 4 out of 20 students have vanilla ice cream and the rest have chocolate. What is the ratio of the number of students who have vanilla to the number of students who have chocolate?

Calculate the derivative for \( f(x)=(\sqrt{x}+52)(\sqrt{x}-51) \) (Use symbolic notation and fractions where needed.) \( f^{\prime}(x)=\square \) help (fractions)

Given: \( f(x)=x^{3}-6 x^{2}+9 \), Determine the intervals where this function is increasing and where it is decreasing and find it's critical points.

\( x^{3}\times y^{2} \)

If the exchange rale rale is \( E 1=R 8,1671 \) and \( E 1= \) h 12,1668 . Determine the exchorgt rale beperen the ears and the pound.

2) Una escalera de 20 metros está apoyada sobre la pared; el pie de la escalera esta a 16 metros de la pared ¿cual es la altura de la pared? (2 puntos)