A number multiplied by -7, subtracted drom the sum of 7 and five times athe number

Mathematics

2 answers:

Ad libitum [116K]2 years ago

7 0

I always use Socratic see if that’ll help

timurjin [86]2 years ago

5 0

7+5×B - B×(-7)? Please correct me if you see a mistake!

-Sarah

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the legs of a right triangle have lengths of 28 meters and 21 meters. the hypotenuse has a length of 5x meters. what is the valu

Hitman42 [59]

We have a right triangle with
a = one leg = 28
b = other leg = 21
c = hypotenuse = 5x

use the pythagorean theorem (a^2+b^2 = c^2) and solve for x

a^2+b^2 = c^2
28^2+21^2 = (5x)^2
784+441 = 25x^2
1225 = 25x^2
25x^2 = 1225
(25x^2)/25 = 1225/25
x^2 = 49
sqrt(x^2) = sqrt(49)
|x| = 7
x = 7 or x = -7

Since the hypotenuse has length 5x meters, this means
5x = 5*7 = 35
or
5x = 5(-7) = -35

Toss out the negative length as it makes no sense.

The only value of x is x = 7

Therefore the final answer is x = 7

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2 years ago

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eduard

The answer is five tenths

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3 years ago

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Nostrana [21]

Answer:

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Step-by-step explanation:

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Answer:

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