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 }

​

c. y = 1/4 x + 5

step-by-step explanation:

first, put the equation of the line on the graph into slope-intercept form

(y = mx + b):   y = -4x + 8

second, a perpendicular line has to have "an opposite/reciprocal slope" to the original slope. so, find the "m" value in your original equation (it's -4, right? )

original slope: m = -4   perpendicular slope: change the sign to its opposite and find the reciprocal ("flip" the number)

new slope is now positive (b/c the original slope was negative 4), and it's 1/4 (not the original slope of 4 or 4/1)

answer: 88

step-by-step explanation:

x² + 3x + 7 = 0       [ax² + bx + c]

a = 1

b = 3

c = 7

quadratic formula:

    (+/- is this ±)

plug in the numbers into the variables

your answer is a

answer: 12,000

step-by-step explanation: first you ar e supposed to add. then multiply then subtract