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3 years ago

6

What is the first step in solving 3x+4=20

2 answers:

mariarad [96]3 years ago

8 0

Answer:

Subtract four on both sides.

Step-by-step explanation:

When we solve for x, we do the reverse of PEMDAS. The last letter is S, so we subtract. There is no subtraction, so we move to A for addition. There is addition, the plus 4, so to get rid of it, we subtract 4 on each side.

omeli [17]3 years ago

4 0

Answer: Subtract 4 from both sides of the equation.

Step-by-step explanation: In algebra, the equal sign separates and equation. 20 is a separate part. You would take the +4 and subtract it from itself and then also subtract 4 from the 20 which would give you 3x=16

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Brilliant_brown [7]

Answer:

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Average: 15.33.. or 15

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3 years ago

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hoa [83]

Answer:

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Step-by-step explanation:

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3 years ago

olasank [31]

Answer:

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Step-by-step explanation:

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3 years ago

The angle of elevation to the top of a skyscraper is measured to be 2 degrees from a point on the ground 1 mile from the buildin

Alex

Answer:

0.034921 miles or 1843774 feet tall

Step-by-step explanation:

Using trigonometric functions we know that $x=rcos(\theta)$ and $y=rsin(\theta)$ where $\theta$ =angle and r is the hypotenuse of the triangle.

First we will calculate the hypotenuse using the x equation, since we know x = 1 mile (distance from the building on the ground) we have:

$x=rcos(\theta)\\\\1=rcos(2)\\\\r=\frac{1}{cos(2)} \approx. 1.0061mi$

Now we will calculate the height of the building using the y equation and so:

$y=rsin(\theta)\\\\y=\frac{1}{cos(2)} \times sin(2) = \frac{sin(2)}{cos(2)}=tan(2)=0.034921mi$

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3 years ago

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Answer:

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Step-by-step explanation:

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3 years ago