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3 years ago

A expressao [(-7)³ - (-7³)] - [(-7)² + 7²] resulta em

2 answers:

7 0

[(-7)³ - (-7³)] - [(-7)² + 7²]

= <span> [(-343 - (- 343)] - [49 + 49 ]

= </span> [-343 + 343] - [49 + 49 ]

= [0] - [98 ]

= -98 (Answer D)

borishaifa [10]3 years ago

5 0

Hey there :)

[ ( - 7 )³ - ( - 7³ ) ] - [ ( - 7 )² + 7² ) ]
↓ ↓ ↓ ↓
[( - 343 ) - ( - 343 )] - [( 49 ) + ( 49 )]

Since there are brackets, according to the order of operations, we do perform them separately )

0 - [ 98 ]
- 98

Your answer will be option C) - 98

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3 years ago

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3 years ago

In the blueprint for A rectangular balcony is 1 inch by 1.75 inches if the actual length is 7 feet what is the perimeter

Elenna [48]

Answer:

22 feet

Step-by-step explanation:

Given

In blue print,dimensions of rectangular balcony are, length(l)=1.75inch and breadth(b)=1inch
The actual length(L)=7 feet

To find the actual perimeter, we need the breadth of balcony(B)

The ratio of length to breadth in blue print must be equal to the ratio of actual length to breadth

⇒

$\frac{\text{length of rectangular balcony in blueprint}}{\text{breadth of rectangular balcony in blueprint}} =\frac{\text{length of rectangular balcony actually}}{\text{breadth of rectangular balcony actually}}$

$\frac{l}{b} =\frac{L}{B} \\B\times l=L \times b\\B= \frac{L \times b}{l}=\frac{7 \times 1}{1.75} =4$

Therefore Breadth actually=4 feet

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$=2\times(length+breadth)\\=2\times(7+4)\\=2\times(11)\\=22$

Therefore perimeter of rectangular balcony= 22 feet

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4 years ago