What is the sum of the first seven terms of the geometric series where a1 = 10 and r = -2? Hint: SR
a1(1 – ya)
r71, where a, is the first term and r is the common ratio.
1-
O S7 = 640
O S7= -430
O S7 = 430
OS7= -213

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)

step-by-step explanation:

because it just is