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soldi70 [24.7K]
3 years ago
7

To find 19 + (11+37), Lennie added 19 and 11. Then he added 37 to the sum. What property did he use ?

Mathematics
2 answers:
Nutka1998 [239]3 years ago
7 0

Lennie used the associative property.

The associative property basically shows that in any order the parenthesis are grouped, you will get the same number.

For example: 19+(11+37)= (19+11)+37=67

Ad libitum [116K]3 years ago
3 0

19 + (11+37) = (19 + 11) + 37

Associative property of addition

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algol [13]
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3 years ago
Two streets bounding your triangular lot make an angle of 74∘. The lengths of the two sides of the lot on these streets are 126
ycow [4]

Answer: a) Yes, there is enough fance

b) 58.1° and 47.9°

c) The city will not approve, because 1/3 of the area is just 2220.5ft²

Step-by-step explanation:

a) using law of cosines: x is the side we do not know.

x² = 126² + 110² - 2.126.110.cos74°

x² = 20335.3

x = 142.6 ft

So 150 > 142.6, there is enough fance

b) using law of sine:

sin 74/ 142.6 = sinα/126 = sinβ/110

sin 74/ 142.6 = sinα/126

0.006741 = sinα/126

sinα = 0.849

α = sin⁻¹(0.849)

α = 58.1°

sin 74/ 142.6 = sinβ/110

sin 74/ 142.6 = sinβ/110

0.006741 = sinβ/110

sinβ = 0.741

β = sin⁻¹(0.741)

β = 47.9°

Checking: 74+58.1+47.9 = 180° ok

c) Using Heron A² = p(p-a)(p-b)(p-c)

p = a+b+c/2

p=126+110+142.6/2

p=189.3

A² = 189.3(189.3-126)(189.3-110)(189.3-142.6)

A = 6661.5 ft²

1/3 A = 2220.5

So 2300 >  2220.5. The area you want to build is bigger than the area available.

The city will not approve

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3 years ago
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8 0
2 years ago
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Dvinal [7]
\left \{ {{2x+y=7\ \ | *4} \atop {3x-4y=5}} \right. \\\\ \left \{ {{8x+4y=28} \atop {3x-4y=5}} \right. \\+----\\Addition\ method\\\\&#10;11x=33\ \ \ | divide\ by\ 11\\&#10;x=3\\\\y=7-2x\\&#10;y=7-2*3=7-6=1\\\\Solution:\\ \left \{ {{y=1} \atop {x=3}} \right.
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madreJ [45]

Answer:

14.42inches

Step-by-step explanation:

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s= 14.42inches

Hence the required length ix 14.42inches

3 0
2 years ago
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