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seraphim [82]
4 years ago
6

What property is 7(x-y)=7x-7y

Mathematics
2 answers:
irakobra [83]4 years ago
7 0

Answer:

0 = 0

Step-by-step explanation:

Simplifying

7(x + -1y) = 7x + -7y

(x * 7 + -1y * 7) = 7x + -7y

(7x + -7y) = 7x + -7y

Add '-7x' to each side of the equation.

7x + -7x + -7y = 7x + -7x + -7y

Combine like terms: 7x + -7x = 0

0 + -7y = 7x + -7x + -7y

-7y = 7x + -7x + -7y

Combine like terms: 7x + -7x = 0

-7y = 0 + -7y

-7y = -7y

Add '7y' to each side of the equation.

-7y + 7y = -7y + 7y

Combine like terms: -7y + 7y = 0

0 = -7y + 7y

Combine like terms: -7y + 7y = 0

0 = 0

Solving

0 = 0

just olya [345]4 years ago
7 0

Answer:

Distributive Property

Step-by-step explanation:

When we're distributing something, there will always be a number or a variable is outside of a parenthisis signaling that you would need to multiply.

for Ex. 7(x-y), since there is a number that is connected to the outside of the parenthesis, that is a signal that we would need to multiply or distribute

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Step-by-step explanation:

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6.1.7 (Video Solution) An article in Human Factors (June 1989) presented data on visual accommodation (a function of eye movemen
horsena [70]

Answer:

- the sample mean is 44

- the sample standard deviation is 12.35

Step-by-step explanation:

given information:

data, x_{i} = 36.45, 67.90, 38.77, 42.18, 26.72, 50.77, 39.0, 50.23

the number of data, n = 8

the sample mean, xbar

xbar = ∑x_{i}/n

       = (36.45+67.90+38.77+42.18+26.72+50.77+39.0+50.23)/8

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       = 44

standard deviation, s

s = \sqrt{sum(x_{i} - xbar)^{2}/n-1}

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7 0
3 years ago
Daryl measures the angle of elevation to be 62 degrees. Frances measures the angle of elevation to be 54 degrees. if the two ent
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Answer:

<em>The helicopter is 27.38 m far off the ground</em>

Step-by-step explanation:

The drawing shown in the image below has all the measures and variables needed to solve the problem.

We need to find R, the height of the helicopter. We'll use the law of sines to find the length of side a.

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\displaystyle a=\frac{28}{\sin 64^\circ}\cdot \sin 54^\circ

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a = 31.11 m

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\displaystyle \sin 62^\circ=\frac{R}{a}

Solving for R:

R=a\sin 62^\circ

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The helicopter is 27.38 m far off the ground

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