Quistion 8 (3 points) Which major reason is there for building dams on the rivers of the West? to regulate temperatures to provide hydroelectric power to produce ethanol Question 9 ( 3 points)

(1) \( \lim _{x \rightarrow 1} \frac{\sqrt[2]{x^{2}+1}}{x+1} \)

\( x = - 15 \pm \sqrt { } \)

Her work is shown below. \( -15 \frac{1}{2}+5 \frac{3}{4} \) \( =-\frac{31}{2}+\frac{23}{4} \) \( =-\frac{31}{2} \times \frac{23}{4} \) \( =-\frac{713}{8} \) When she checked the answer by estimating, it did not make sense. What error did Wen make? Wen incorrectly converted a mixed number to an improper fraction. Wen added the numerators and denominators instead of multiplying. Wen did not take the reciprocal of the divisor. We the division problem to multiplication.

a) \( \frac{3}{5} \) \( \begin{array}{lll}\text { 139) Representa en la recta numérica cada nummero racional } \\ \text { b) } \frac{7}{3} & \text { c) }-\frac{4}{2} & \text { e) }-\frac{6}{4}\end{array} \)

2. List the rational numbers among the following: \( \frac{29}{84} ; 0,165 ; \pi ;-\frac{18}{7} ; 0,44444444 \ldots ;-7,375 ; \sqrt{42} \); \( 6 \frac{1}{2} ; 0,234 \)