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Yakvenalex [24]
3 years ago
15

During a tropical storm, the temperature decreased from 84° to 63º. Find the percent decrease in temperature during the storm. (

a) 33% (b) 25% (c) 40% (d) 75%​
Mathematics
1 answer:
kipiarov [429]3 years ago
3 0

Answer:

b

Step-by-step explanation:

b is the answer

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Answer:

(a).

S_{n} =  \frac{n}{2} (4n + 20) \\  \\S _{n - 1} =  \frac{(n - 1)}{2} (4n - 4 + 20) \\  \\ S _{n - 1} =  \frac{(n - 1)}{2} (4n + 16) \\  \\S _{n - 1} = \frac{(n - 1)(4n + 16)}{2}  \\   \\  { \boxed{S _{n - 1} =  {2 {n}^{2} + 6n - 8}}} \\

(b).

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S _{n - 1} =  \frac{(n - 1)}{2} (4n + 16)

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common difference:

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Answer:

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