Find any inflection points of f . Select the correct choice below and, if necessary, fill in the answer box to complete your choice. (D). The function has an inflection point at \( (0,6) \). (Type an ordered pair, using integers or fractions. Use a comma to separate answers as needed.) B. The function f has no inflection points.

Use a Riemann sum to approximate the area under the graph of \( f(x)=4 e^{-x} \) on the interval \( 0 \leq x \leq 1 \) using \( n=5 \) subintervals with the selected points as the right end points. The area is approximately \( \square \) units. (Round to six decimal places as needed.)

2) La ecuación del movimiento de una particula está dada por: \( s(t)=t^{3}-3 t \) Encontrar: a) La velocidad como función de \( t \) b) La aceleración después de 4 segundos. c) la aceleración cuando la velocidad es cero.

2. \( y=\frac{3^{\sqrt{x}}}{\lg (3-x)} \)

1. \( y=\frac{x}{\sqrt[4]{25-x^{2}}} \)

7. c) \( \frac{1}{1+x}-\frac{2}{x^{2}-1} \)