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Softa [21]
3 years ago
5

Can anyone explain #4 on how to do it

Mathematics
2 answers:
N76 [4]3 years ago
6 0
\frac{(n-2)\cdot180}{n}=144\\
180n-360=144n\\
36n=360\\
n=10

It's decagon.
Lana71 [14]3 years ago
5 0
Here is the formula for find the one inside of the polygon: 
(n-2).180/n (n shows how many sides does polygon have)
so now we can solve the equation==== (n-2).180/n=144
1144n=(n-2).180
144n=180n-360
360=36n
n=10 
so we call it decagon :) 

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7 0
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An automotive repair center charges $45 for any part of the first hour of labor, and $25 for any part of each additional hour. W
IceJOKER [234]
The total cost is given by the equation:
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We can check for each option in turn:

Option A:

Inequality 5 < x ≤ 6 means the hour is between 5 hours (not inclusive) to 6 hours (inclusive)
Let's take the number of hours = 5
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Let's take the number of hours = 6
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Option B:
The inequality is 6 < x ≤ 7
We take number of hours = 6
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We take number of hours = 7
Then C(7) = 25(7-1) + 45 = 195

Option C:
The inequality is 5 < x ≤ 6
Take the number of hours = 5
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Take the number of hours = 6
C(6) = 25(6-1) + 45 = 170
We can't take the value 145 as '5' was not inclusive in the range, but we can take 170

Option D:
6 < x ≤ 7
25(6-1) + 45 < C(t) ≤ 25(7-1) + 45
170 < C(t) ≤ 195

Correct answer: C


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F(2)=42(2)-100
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3 years ago
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