$\bf A(n)=-3\cdot 2^{n-1}\\\\
-------------------------------\\\\
\textit{first one}\qquad A(1)=-3\cdot 2^{1-1}
\\\\\\
\textit{fourth one}\qquad A(4)=-3\cdot 2^{4-1}
\\\\\\
\textit{eighth one}\qquad A(8)=-3\cdot 2^{8-1}$

8 0

3 years ago

f a rectangle has a perimeter of 70, a length of x and a width of x - 9, find the value of the length of the rectangle.

trasher [3.6K]

$( x + (x - 9)) \times 2 = 70 \\( 2x - 9) \times2= 70 \\ 4x - 18 = 70 \\ 4x = 70 + 18 = 88$
$x = \frac{88}{4} = 22$
the length is 22

and the width is
22-9=17

good luck

3 0

3 years ago

4(4b-8)-3/8<br> Please help i have no idea what to do

Ksivusya [100]

Answer:

$4(4b - 8) - \frac{3}{8} \\ 16b - 32 - \frac{3}{4} \\ \frac{64b - 128 - 3}{8} \\ \frac{64b - 131}{8}$

hope this will help you

7 0

2 years ago