What is the explicit equation for the following geometric sequence? 18, 9, 4.5, 2.25,...

a
\large a_n=\left(18\right)2^{n-1}

b
\large a_n=\left(18\right)-2^{n-1}

c
\large a_n=\left(18\right)-\frac{1}{2}^{n- 1}

d
\large a_n=\left(18\right)\frac{1}{2}^{n-1 }

​

goog may be able to you find that answer

{x = -1/2 ,   y = -1

step-by-step explanation:

solve the following system:

{2 x + y = -2

{10 x - 3 y = -2

in the first equation, look to solve for y:

{2 x + y = -2

{10 x - 3 y = -2

subtract 2 x from both sides:

{y = -2 x - 2

{10 x - 3 y = -2

substitute y = -2 x - 2 into the second equation:

{y = -2 x - 2

{10 x - 3 (-2 x - 2) = -2

10 x - 3 (-2 x - 2) = (6 x + 6) + 10 x = 16 x + 6:

{y = -2 x - 2

{16 x + 6 = -2

in the second equation, look to solve for x:

{y = -2 x - 2

{16 x + 6 = -2

subtract 6 from both sides:

{y = -2 x - 2

{16 x = -8

divide both sides by 16:

{y = -2 x - 2

{x = -1/2

substitute x = -1/2 into the first equation:

{y = -1

{x = -1/2

collect results in alphabetical order:

answer:   {x = -1/2 ,   y = -1

answer: 5100 just subtract

step-by-step explanation:

step-by-step explanation:

jbjuiuhuhuuy