$Let\ say\ r \ the \common\ ratio:\\a)a_4=r^2*a_2=9*a_2\Longrightarrow\ r=3\ (not\ -3\ since\ parts\ are\ positive)\\\\b)\\\displaystyle \sum_{i=1}^{n} a_i =a_1+a_2+a_3+...+a_n\\\\=a_1+a_1*r+a_1*r^2+a_1*r^3+...+a_1*r^{n-1}\\\\=a_1*(1+r+r^2+...+r^{n-1})\\\\=a_1*\dfrac{r^n-1}{r-1} \\\\147620=5*\frac{(3^n-1)}{3-1} \\\\3^n-1=\frac{2*147620}{5} \\\\3^n=59049 \\\\n*ln(3)=ln(59049)\\\\n=\dfrac{ln(59049)}{ln(3)} \\\\n=10\\\\a_n=5*3^{10-1}=5*19683=98415(cm)$

5 0

2 years ago

7. Two rectangles were used to form the following figure. The dimensions of both rectangles have been provided to the nearest ha

Irina-Kira [14]

Answer:

Step-by-step explanation:

edmentum

5 0

2 years ago

Question 34 please help me

tino4ka555 [31]

740 + 850 x 100=? And there!!

7 0

3 years ago

( p^2 - 8p^4 - 11p^3 ) + ( 4p^2 + 7p^4 )​

( p^2 - 8p^4 - 11p^3 ) + ( 4p^2 + 7p^4 )