Select all of the following statements which are true about electric current. It is a measure of how much work is needed to move a charge It is a measure of how quickly electrons pass a certain point It is a measure of the charge of an item It is measured in amps

\( \frac{\text { Ejercicios }}{1} \) 1) \( \int\left[\frac{6}{4} x^{3 / 2}+\cos \left(\frac{2}{8} x\right)-\frac{1}{9} e^{3 / x}+\frac{1}{\sqrt{1-x^{2}}}\right] d x \) 2 \( \int\left[\frac{1}{x+\frac{7}{9}}-\frac{5}{6} \sec x \tan x+\frac{3}{9} \cos \left(\frac{1}{3} x\right)\right] d x \)

Due corde parallele di una circonferenza sono si- tuate da parti opposte rispetto al centro e sono lunghe rispettivamente \( 38,4 \mathrm{~cm} \) e 32 cm . Sapen- do che il raggio della circonferenza misura 20 cm , calcola l'area del trapezio avente per basi le due corde. [619,52 \( \left.\mathrm{cm}^{2}\right] \)

2. Housing: \( 20 \% \) of gross income. A. \( \$ 1,750 \) B. \( \$ 7,000 \) C. \( \$ 700 \) D. \( \$ 7,350 \)

Withour using a calculator or mathematical tables, evaluate \( 49^{\frac{3}{2}} \times\left(\frac{256}{2401}\right)^{\frac{3}{4}} \)

Which of the following is a factor of the polynomial below? \( 4 x^{3} y-8 x^{2} y^{2}+10 x y^{3} \) \( \begin{array}{llll}\text { A. } 4 y^{2} & \text { B. } 2 x^{2} & \text { C. } 2 x y & \text { D. } x^{2} y^{2}\end{array} \)