The number of weekly hours spent on a smart device varies inversely with the person's age. If a 20-year-old person spends 52 hours on their smart device each week, how many hours does a 50-year-old person spend on their smart device?

20.8 hours

Step-by-step explanation:

Given that hours (h) varies inversely with age (a) then the equation relating them is

h = ← k is the constant of variation

To find k use the condition h = 52 when a = 20, thus

52 = ( multiply both sides by 20 )

1040 = k

h = ← equation of variation

When a = 50, then

h = = 20.8 hours

answer

false

explanation

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