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zubka84 [21]
3 years ago
12

The sum of two integers is two times their difference. Which of the following algebraic equations demonstrates this? A) (x + y)

= 2(x - y) B) (x + y) = (x - y) + 2 C) (x + y) = (x - y) - 2 D) 2(x + y) = 2(x - y) E) 2(x + y) = (x - y)
Mathematics
1 answer:
netineya [11]3 years ago
3 0

Answer:

It is A)

Step-by-step explanation:

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Find the equation of the line which passes through the point (-4,12) and is perpendicular to the given line. Express your answer
Vika [28.1K]

Answer:

y = 1/7x + 88/7

Step-by-step explanation:

y = mx +b

since it is perpendicular you have to get the negative reciprocal of the slope which is 1/7

y = 1/7x + b then you would plug in your points

12 = 1/7(-4) + b and then solve for b

12 = -4/7 + b

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Solve x^2 + 4x + 8 = 0
Mkey [24]

Answer:

x = -2 + 2 i or x = -2 - 2 i

Step-by-step explanation:

Solve for x:

x^2 + 4 x + 8 = 0

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x^2 + 4 x = -8

Add 4 to both sides:

x^2 + 4 x + 4 = -4

Write the left hand side as a square:

(x + 2)^2 = -4

Take the square root of both sides:

x + 2 = 2 i or x + 2 = -2 i

Subtract 2 from both sides:

x = -2 + 2 i or x + 2 = -2 i

Subtract 2 from both sides:

Answer:  x = -2 + 2 i or x = -2 - 2 i

8 0
2 years ago
The temperature drops 17° to 37° . what was the temperature when we started?
Alex Ar [27]
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3 years ago
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CCSS Math 7
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Answer:

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a = 112

b = 68

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a = 127

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I'll help you with the rest later

Step-by-step explanation:

a = 112 because of allied angles rule

b and c = 68 because of angles at a point

360-112-112 ÷2

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180-38-15

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using angles on a straight line, 180 - 70 - 40 ÷ 2

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since a=30, take 90 - 30 to get b, 70

d= 70, vertically opposite angles

e = 130 because a+b+c, vertically opposite angles

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