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3 years ago

Which equation can be used to find the perimeter of the rectangular chalkboard

Mathematics

1 answer:

Alik [6]3 years ago

4 0

If the chalkboard is just rectangular we can just use:

(2 x L) + (2 x W)

L+L+W+W

L= Length

W= Width

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I need to figure out what x is for my homework and I’m so confused teehee.

garik1379 [7]

Answer:

x = 9

Step-by-step explanation:

set a proportion: 8/12 = 6/x => 8x = 72 => x = 9

3 0

3 years ago

The magnitude and direction of two vectors are shown in the diagram. What is the magnitude of their sum?

VLD [36.1K]

Separate the vectors into their x- and y-components. Let u be the vector on the right and v the vector on the left, so that

u = 4 cos(45°) x + 4 sin(45°) y

v = 2 cos(135°) x + 2 sin(135°) y

where x and y denote the unit vectors in the x and y directions.

Then the sum is

u + v = (4 cos(45°) + 2 cos(135°)) x + (4 sin(45°) + 2 sin(135°)) y

and its magnitude is

||u + v|| = √((4 cos(45°) + 2 cos(135°))² + (4 sin(45°) + 2 sin(135°))²)

… = √(16 cos²(45°) + 16 cos(45°) cos(135°) + 4 cos²(135°) + 16 sin²(45°) + 16 sin(45°) sin(135°) + 4 sin²(135°))

… = √(16 (cos²(45°) + sin²(45°)) + 16 (cos(45°) cos(135°) + sin(45°) sin(135°)) + 4 (cos²(135°) + sin²(135°)))

… = √(16 + 16 cos(135° - 45°) + 4)

… = √(20 + 16 cos(90°))

… = √20 = 2√5

5 0

3 years ago

Read 2 more answers

How do I find the value of y in y=mx+c

Fofino [41]

Plug in your coefficients

3 0

3 years ago

What is y? i am having trouble figuring out what y is

Andre45 [30]

Answer:

$\sf \boxed{\bf y =5\sqrt{22}}$

Step-by-step explanation:

<h3>45° - 45° - 90° triangle:</h3>

The ratio of sides of 45 - 45 - 90 triangle is a : a : a√2.

a is the side opposite to 45°.

From the figure, a = 5√11

The side opposite to 90° is a√2.

y = a√2

$\sf = 5\sqrt{11} * \sqrt{2}\\\\ = 5*\sqrt{11*2}\\\\ = 5\sqrt{22}$

8 0

1 year ago

On the coordinate plane, Kyle graphs a line that represents a proportional relationship between x and y

goldenfox [79]

Option D) (0, 0)

<h2>Explanation:</h2>

The complete question is:

_______________________________________

On the coordinate plane, Kyle graphs a line that represents a proportional relationship between x and y. Which point MUST be on the line?

A) (0, 1)

B) (1, 0)

C) (1, 1)

D) (0, 0)

_______________________________________

A proportional relationship between x and y can be written in a mathematical language as follows:

$y=kx$

For any non-constan k-value. As you can see, this k-value represents the slope of a line. Remember that the Slope-intercept form of a line is given by:

$y=mx+b \\ \\ m:Slope \\ \\ b:y-intercept$

In the case of $y=kx$ the y-intercept is zero, so the line passes through.

In conclusion, Kyle's graph is a line that represents a proportional relationship between x and passes through point (0, 0)

<h2>Learn more:</h2>

Direct variation: brainly.com/question/13881905

#LearnWithBrainly

7 0

3 years ago