Selesaikan permasalahan berikut.

<p>soal exponent</p><p>5. diketahui:</p><ul><li>&nbsp; &nbsp; &nbsp;ada 3 bakteri=&gt; a=3</li><li>masing-masing mebelah 2 setiap 20 menit.&nbsp;</li></ul><p>&nbsp; &nbsp; rumus : a. r^t</p><p>^{&nbsp; &nbsp; &nbsp;}a= jumlah awal</p><p>&nbsp; &nbsp; r= membelah berapa?</p><p>&nbsp; &nbsp; t= berapa kali? ( misal, kalau diketahui selama 60 menit, berarti t= 60/20= 3 )</p><p>darimana? oke gambarkan, ada 3 bakteri, 20 menit kemudian, berarti ada, 1.2+1.2+1.2 bakteri berarti 6, coba pakai rumus tadi,&nbsp;</p><p>3. 2^20/20</p><p>= 3. 2</p><p>=6. sama, berarti benar,kan?</p><p>oke jawab no.a)&nbsp;</p><p>diketahui: 5 menit kemudian=&gt; 5 menit+20 menit= 25 menit</p><p>a.r^t</p><p>=3.2^25/20</p><p>= 3.2^1.25</p><p>= 3. 2,38</p><p>≈7.135≈7.14</p><p>no.b)&nbsp;</p><p>diketahui: jumlah bakteri yang berkembangbiak 6 291 456 bakteri</p><p>ditanya: pada menit ke-berapa?</p><p>jawab: 6 291456= a.r^{n/20. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;}n= menit keberapa?</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6 291456 = 3.2^n/20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;6 291456/3= 2^n/20</p><p>^{&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;&nbsp;}2097152= 2^n/20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;2²¹= 2^n/20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;lupakan 2</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;21=n/20</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;n= 20.21=420 menit</p><p>&nbsp;</p><p>6. diketahui:</p><ul><li>dosis awal 500mg</li><li>terurai 1/2 dari dosis setiap hari</li></ul><p>&nbsp; &nbsp; &nbsp;ditanya: sisa pada hari kelima?</p><p>&nbsp; &nbsp; &nbsp;jawab: remember a.r^t?&nbsp;</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;500.(0,5)^{5/1. &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;=&gt; 5 hari dari 1 hari}</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 500. (0,5)⁵</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 500. 0,03125</p><p>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp;= 15,625 mg&nbsp;</p><p>&nbsp;</p>