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Inessa [10]
3 years ago
11

Which equation has solution x = -3?

Mathematics
1 answer:
____ [38]3 years ago
4 0
A) 2x - 7 = -1

Add 7 to both sides of the equation.

2x = 6

x = 3

Choice A is not the answer.


B) 3x + 8 = 1

Subtract 8 from both sides.

3x = -7

Divide both sides by 3.

x = -2.3 repeating

Choice B is not the answer.

C) 1/2x + 8 = 10

1/2x = 2

Divide both sides by 1/2.

x = 4

Choice C is not the answer.

By process of elimination, choice D is the answer.

D) 1/2(2x - 6) = -6

x - 3 = -6

Add 3 to both sides.

x = -3
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Help me with this question ​
enot [183]

Answer:

37.2

Step-by-step explanation:

when you turn the small triangle LMN to its right angle to cover the right angle of KLM, you find that they are similar triangles.

therefore the corresponding side lengths are at the same ratio.

LM/KM = MN/LN

LM = 24

MN = 13

we can get LN via Pythagoras of the small triangle

LN² + MN² = LM²

LN² + 13² = 24²

LN² = 24² - 13² = 576 - 169 = 407

LN = sqrt(407) = 20.174241

now back to our main problem

24/KM = 13/sqrt(407)

24×sqrt(407)/13 = KM = 37.2

4 0
3 years ago
To the nearest degree, what is m_A? Explain
noname [10]

Answer:

A= 53

Step-by-step explanation:

Given

BC = 9,6

AC = 7.2

Required: Angle A

This is calculated using:

tan\ A = \frac{Opposite}{Hypotenuse}

From the attachment;

Opposite = 9.6

Adjacent = 7.2

So:

tan A =\frac{9.6}{7.2}

tan A =1.333

Take arctan of both sides

A= tan^{-1}(1.333

A= 53----- approximated

7 0
3 years ago
How many people will die between the ages 99 and 100
defon

A lot of people will die xD

8 0
4 years ago
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Kimberly has five puppies the weight of the puppies are 6 pounds and 14 lb and 6 pounds in foot pounds and seven pounds what is
MAVERICK [17]

Answer:

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Step-by-step explanation:

4 0
3 years ago
Find the x intercept. y = x + 3 / x - 2
VikaD [51]

Answer:

(-3, 0).

Step-by-step explanation:

At the x intercept y = 0 so

(x + 3) / (x - 2) = 0

x + 3 = 0

x = -3.

x-intercept is at (-3,0).

8 0
4 years ago
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