Given the sequence 12.3, 15.2, 18.1, 21, 23.9, ..., find the recursive formula.
A. a1=12.3 and an+1=an−2.9
B. a1=12.3 and an+1=an−0.9
C. a1=12.3 and an+1=an+2.9
D. a1=12.3 and an+1=an+1.1

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)

it has to have an angle of 90 degrees