18. The police play a very important role in our society. 19. Theft is seen as immoral in our community. 20. Farmers and fishermen are exposed to bilharzia. 21. It occasionally happens that a change in concentration affects the chemical action that occurs 22. This acute infection of the brain is almost similarly fatal. 23. That is the deceptive nature of gambling that must be controlled. 24. The teacher felt she needed to give out compliments to each student so that they could feel better about themselves. 25. The public work suffers from the consequences of white ants.

QUESTION 2. Identify the stages of e-business evolution -- adoption growth, maturity, and transformation -- and discuss the majo characteristics of each stage.

In Exercise 8 , use synthetic division to find the quoti and the remainder when the first polynomial is divided by second polynomial. 8. \( x^{3}-x^{2}-7 x+2 ; x-1 \)

Relaciona ada multiplicación con su respectivo producto. \( \begin{array}{ll}\text { 97. }(-3) \times(4) \times(-6) & \text { b. }-72 \\ \text { 98. }(-10) \times(9) & \text { c. } 144 \\ \text { 99. }(-4) \times(-2) \times(-6) \times(-3) \\ 100 .(6) \times(5) \times(-3) \times(-1) & \text { d. } 90 \\ 101.9 \times(-8) & \text { e. } 72 \\ 102 .(4) \times(3) \times(-12) & \text { f. }-144\end{array} \)

3. Dadas las funciones vectoriales \( \overrightarrow{r(t)}=\cos t i+\operatorname{sen} t \mathrm{j}-e^{2 t} k \) y \( \overrightarrow{\mathrm{u}}=t i+\operatorname{sen} t j+\cos t k \) calcule \( \frac{d}{d r}\left(r(t) \cdot r^{\prime}(t)\right) \)

\( \checkmark \) 3. A radioactive substance has a half-lif of 1000 years. How long will it take \( \checkmark \) (a) half the substance to decay \( \quad \checkmark \) (b) three-quarters of it to decay \( \checkmark \) (c) \( 90 \% \) of it to decay \( \quad \checkmark \) (d) all of it to decay?