From the given, we can say that this is arithmetic sequence
n = 2
a₁ = 10
a₂ = 12.5
d = a₁ - a₂ = 12.5 - 10 = 2.5
Get the function of, we have
g(n) = 10 + 2.5n
where n = number of weeks
We use g(n) for growth in terms of week.
Answer: g(n) = 10 + 2.5n
10 + 2.5(-2)
= 10 - 2.5 · 2
= 10 - 5
= 5
10 + 2.5(-1)
= 10 - 2.5 · 1
= 10 - 2.5
= 7.5
10 + 2.5(0)
= 10 + 2.5 · 0
= 10 + 0
= 10
10 + 2.5(1)
= 10 + 2.5 · 1
= 10 + 2.5
= 12.5
10 + 2.5(2)
= 10 + 2.5 · 2
= 10 + 5
= 15
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