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algol [13]
3 years ago
7

The first side of a triangle is twice the length of the second side; the third side is 20 feet less than three times the second

side. The perimeter of the triangle is 106 feet. Find the three sides.
Mathematics
1 answer:
dsp733 years ago
3 0

x=2nd side

2x=1st side

3x-20=3rd side

x+(2x)+(3x-20)=106

6x-20=106

6x-20+20=106+20

6x=126

6x/6=126/6

x=21

1st side=42 ft

2nd side-21 ft

3rd side=43 ft

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NeX [460]
Hello,

As 4²+(5/2)²=22.25=89/4 (Pytagorean theorem)
Perimeter of the triangle =2*√89 /2 +5 =5+√89
Lateral area: 18*(5+√89)
Total area= 90+18√89+ 4*5/2 *2 =110+18√89 ≈279.811..(ft²)
8 0
4 years ago
Una pared rectangular tiene un perímetro de 48 metros. El largo de la pared es el doble del ancho. ¿Cuántos metros cuadrados de
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Datos:
Perímetro = 48m
Ancho = x
Largo = 2x
Área = (2x)(x)

Ecuación:
2x + 4x = 48
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Sustitución:
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Área = (16)(8)
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Respuesta: Se necesitarán 128 metros cuadrados de papel decorativo
4 0
3 years ago
Leah deposited $50,000 in the bank. Three years later, she borrowed $40,000 for a new truck. From this description, which is the
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6 0
3 years ago
Can someone help me
butalik [34]

Answer:

The answer is 1/3

Step-by-step explanation:

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4 0
3 years ago
Read 2 more answers
A field test for a new exam was given to randomly selected seniors. The exams were graded, and the sample mean and sample standa
swat32
All our answers lie in the above statement.

Confidence Level:
The creator claims that 9 out 10 students will have the average score in the said range. Or in other words we can say that the creator is 90% confident about the result of the field test. So the confidence level is 90%. 

Margin of Error:
The average score lies within 4% of 70%. This means the margin of error is 4% i.e. the average scores can deviate from 70% by 4% .

Confidence Interval:
Lower Limit = 70% - 4% = 66%
Upper Limit = 70% + 4% = 74%

Interpretation:
The exam creator is 90% confident that the average scores of seniors will be between 66% and 74%. 
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3 years ago
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