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Liula [17]
3 years ago
14

Question Help

Mathematics
1 answer:
Bingel [31]3 years ago
6 0

Answer:

19.6

Step-by-step explanation:

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c^ 2 = a^2 + b^2

given a = 2 and b = 5

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c^2 = 2^2 + 5^2

or

2^2 + 5^2 = c^2

answer is the first one

2^2 + 5^2 = c^2

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The total length of pencils A, B and C is 29 cm. Pencil a is 11 cm shorter then pencil B, and pencil B is twice as long a pencil
satela [25.4K]

The length of pencil A is 5 cm

<em><u>Solution:</u></em>

Let the length of pencil A be "x"

Let the length of pencil B be "y"

Let the length of pencil C be "z"

<em><u>The total length of pencils A, B and C is 29 cm</u></em>

Therefore,

length of pencil A + length of pencil B + length of pencil C = 29

x + y + z = 29 ------------ eqn 1

<em><u>Pencil A is 11 cm shorter then pencil B</u></em>

x = y - 11 ------- eqn 2

<em><u>Pencil B is twice as long a pencil C</u></em>

y = 2z

z = \frac{y}{2} ------ eqn 3

<em><u>Substitute eqn 2 and eqn 3 in eqn 1</u></em>

y - 11 + y + \frac{y}{2} = 29\\\\2y + \frac{y}{2} = 29 + 11\\\\\frac{4y+y}{2} = 40\\\\5y = 80\\\\y = 16

<em><u>Substitute y = 16 in eqn 2</u></em>

x = 16 - 11

x = 5

Thus length of pencil A is 5 cm

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3 years ago
Which of the following is the sum of the polynomials 5x^2-4x+1 and -3x^2+x-3??
Katyanochek1 [597]

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