nas5119
30.07.2019 •
Mathematics
The windows of a downtown office building are arranged so that each floor has six fewer windows than the floor below it. if the ground floor has 52 windows, how many total windows are on the first eight floors?
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Ответ:
windows on first floor = 52
windows on 8th floor (52 - 6 * 7) = 10
average windows = (52 + 10)/2 = 62/2 = 31
8 floors * 31 average windows = 248.
Ответ:
There are 248 windows on the first eight floors.
Step-by-step explanation:
As given:
The ground floor has 52 windows.
This question is based on arithmetic sequence:
a1 = 52
d = - 6 (each floor has six fewer windows than the floor below it)
=>
=>
We know:
= 248
Therefore, there are 248 windows on the first eight floors.
Ответ:
la = π × r × s
Given:
π = 3.14
r = 7 ft
s = 13 ft
Solution
Input the numbers to the formula
la = π × r × s
la = 3.14 × 7 × 13
la = 285.74
The lateral surface area of the cone is 285.74 square feet