17. Sebuah bola dijatuhkan dari ketinggian 8 meter. Bola memantul ke atas setelah mengenai lantai dengan ketinggian \( \frac{3}{5} \) dari ketinggian semula, begitu seterusnya. Panjang lintasan bola tersebut sampai berhenti adalah .... m . a. 18 b. 22 c. 26 d. 32 e. 36 18. Seutas tali dipotong menjadi 5 bagian sehingga panjang potongan-potongan tali tersebut membentuk barisan geometri. Jika panjang tali terpendek 6 cm dan potongan tali terpanjang 96 cm , maka panjang tali semula adalah... . a. 96 cm b. 185 cm c. 186 cm d. 191 cm e. 192 cm 19. Jika suatu deret geometri tak hingga memiliki rasio \( 2 / 3 \) dan jumlahnya adalah 18 , maka suku pertama deret tersebut adalah .... a. 4 b. 5 c. 6. d. 8 e. 12

Find the magnitude and positive direction angle of the vector \( \langle 2,-2 \sqrt{3}\rangle \). The magnitude of the vector is (Simplify your answer.)

Write the complex number in trigonometric form \( r(\cos \theta+i \sin \theta) \), with \( \theta \) in the interval \( \left[0^{\circ}, 360^{\circ}\right) \). \[ \begin{array}{l}1+i\end{array} \] \( \begin{array}{l}1+i=\square\left(\cos \square^{\circ}+i \sin \square^{\circ}\right) \\ \text { (Type the value for } r \text { as an exact answer, using radicals as needed. Type the value for } \theta \text { as an integer or } \\ \text { as needed.) }\end{array} \)

Write the complex number in trigonometric form \( r(\cos \theta+i \sin \theta) \), with \( \theta \) in the interval \( \left[0^{\circ}, 360^{\circ}\right) \). \[ -3 \sqrt{3}+3 i \] \( -3 \sqrt{3}+3 i=\square\left(\cos \square^{\circ}+i \sin \square^{\circ}\right) \) (Type the value for \( r \) as an exact answer, using radicals as needed. Type the value for \( \theta \) as an intege as needed.)

Suppose the half-life of a drug in the bloodstream is 9 hours. To the nearest milligram, how much of the drug is left in the bloodstream 20 hours after a 260 milligram dose? 56 milligrams 32 milligrams 190 milligrams 117 milligrams

Find the standard form of the equation of the hyperbola satisfying the given conditions. Foci at \( (-7,0) \) and \( (7,0) \); vertices at \( (3,0) \) and \( (-3,0) \)