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kompoz [17]
3 years ago
5

A rectangle has a length of

Mathematics
1 answer:
cupoosta [38]3 years ago
5 0

Answer:

Perimeter of the rectangle=16 x

Step-by-step explanation:

Step 1: Determine the dimensions of the rectangle

Width=x

Length=7 x

But;

Step 2: Determine the perimeter of the rectangle

P=2(L+W)

where;

P=perimeter

L=length

W=width

In our case;

P=unknown

W=x

L=7 x

replacing;

2(x+7 x)=2 x+14 x

16 x

Perimeter of the rectangle=16 x

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When a number has a positive and a negative root, the positive root is called?
gogolik [260]

Answer:

  "principal root"

Step-by-step explanation:

The positive (even or odd) root of a positive real number is called its <em>principal root</em>.

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When an odd root is taken of a negative real number, the negative real root is the principal root. That is -2 is the principal cube root of -8.

3 0
3 years ago
What two positive real numbers whose product is 21 have the smallest possible​ sum?
GalinKa [24]

Answer:

x=\sqrt{21}

y=\sqrt{21}

Step-by-step explanation:

Let x  and y are the two positive real numbers

product of two numbers is 21

x y=21

y=\frac{21}{x}

The sum of the two numbers is f(x) =x+y

Replace y with 21/x

f(x) =x+\frac{21}{x}

we need to find smallest possible sum , so we take derivative using power rule

f'(x)= 1-\frac{21}{x^2}

when sum is minimum then the derivative is equal to 0

0= 1-\frac{21}{x^2}

0=\frac{x^2-21}{x^2}

multiply both sides by x^2

x^2-21=0

x^2=21

Take square root on both sides

x=\sqrt{21}

y=\frac{21}{x}

y=\frac{21}{\sqrt{21}}

y=\sqrt{21}

3 0
4 years ago
Multiply (3w^2-4w+7)(5w+2) Simply the answer
Blizzard [7]

Answer:

− 3 w 2 − 9 w − 4

Step-by-step explanation:

Subtract  6 w 2  from  3 w 2 − 3 w 2 − 5 w − 6 -4 w + 2 Subtract  4 w  from  − 5 w .− 3 w 2 − 9 w − 6 + 2 Add − 6 add 2 . -3 w 2− 9 w− 4

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3 years ago
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kati45 [8]

Answer:

y = 4x - 3

Explanation:

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     4x – y = 3                 Subtract 4x rom each side

            -y = -4x + 3        Multiply each side by -1

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4 years ago
Which of the following statements are not true regarding functions?​
slamgirl [31]

Answer:

what's the answers for the question

7 0
3 years ago
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