3 years ago

Please help, operation with rational numbers XXIV

Mathematics

1 answer:

kifflom [539]3 years ago

3 0

1. D
2. A
3. 79

I'm not confident with 3 but 1 and 2 are for sure correct

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3 years ago

Use the pythagorean theorem to solve the problem. Round your answer to the nearest tenth if necessary.

zmey [24]

Answer:

11.31 ft

Step-by-step explanation:

Here in this problem ladder forms a right triangle with the wall of the house and it is acts as hypotenuse, length of one leg of right triangle given to be 4 feet.

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Hence, by Pythagoras theorem:

${12}^{2} = {4}^{2} + {x}^{2} \\ 144 = 16 + {x}^{2} \\ {x}^{2} = 144 - 16 \\ {x}^{2} = 128 \\ x = \sqrt{128} \\ x = 11.3137085 \\ x = 11.31 \: ft$

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GalinKa [24]

We need to write system of equations to solve this problem.
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b = a+6
c+6 = 2*a

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(2a - 6)^2 = a^2 + (a+6)^2
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3 years ago

3. What is the value of 42 – 2(3 • 5+ 1)?

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Step-by-step explanation:

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Elanso [62]

Answer:

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Step-by-step explanation:

bra

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