1. Complete the following: a. How many seconds a b. How many minutes ar c. Howth? many hours are th d. How many days are th e. How many years are th

8) Sara had 207 dollars to spend on 9 books. After buying them she had 18 dollars. How much did each book cost?

191. La somma di due angoli alla circonferenza misura \( 130^{\circ} 18^{\prime} 24^{\prime \prime} \) e uno di essi è \( 3 / 5 \) dell'altro'. Calcola l'ampiezza dei due angoli al centro corrispondenti. \( \quad\left[97^{\circ} 43^{\prime} 48^{\prime \prime} ; 162^{\circ} 53^{\prime}\right] \)

Une classe de 30 élèves dont 12 filles et 18 gar- çons, doit élire un comité composé d'un pré- sident, un vice-président et un secrétaire. 1) Combien de comités peut-on constituer? 2) Combien de comités peut-on constituer sa- chant que le poste de secrétaire doit être occupé par une fille?

\( (\sqrt{6},-\sqrt{2}) \) une expression.) \( \cos \alpha=\frac{\sqrt{3}}{2} \) (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for the expression.) tan \( \alpha=\square \) (Simplify your answer. Type an exact answer, using radicals as needed. Use integers or fractions for the expression.)

(a) Factor the polynomial over the set of real nur \( f(x)=x^{4}-4 x^{3}+7 x^{2}-16 x+12 \) The factorization over the set of real numbers is \( f(x)= \)