A smart phone manufacturer wants to determine the average battery time that it’s new smart phone will get. The manufacturer will test 100 smart phones. Match the strategy to their corresponding sampling techniques

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)

so, converting firstly the mixed fractions to improper fractions and then "adding".

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step-by-step explanation:

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c(x)= 6x + 3

step-by-step explanation: