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3 years ago

Can talk help me with these three word problems

Mathematics

1 answer:

love history [14]3 years ago

3 0

Please tell me if you dont understand. ill break it down for you

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PLEASE ANSWER ASAP FOR BRAINLEST!!!!!!!!!!!!!!!!!!!!!!!!!!!!!

sukhopar [10]

Answer:

C = 12.57

Step-by-step explanation:

Circumference formula: C = 2πr

divide 4 by 2

4/2 = 2

plug it in

C = 2π(2)

C = 12.57

5 0

3 years ago

Read 2 more answers

Suppose x varies directly with x if y=16 and x=-8what is the value of x when y=-14

Sonbull [250]

The value of x when y = -14 is 7

Step-by-step explanation:

Direct variation is a relationship between two variables that can

be expressed by an equation in which one variable is equal to a

constant times the other

If y varies directly with x, then

y ∝ x
y = k x, is the equation of variation where k is the constant of variation

∵ y varies directly with x

∴ y ∝ x

∴ y = k x

To find k substitute x and y by their initial values

∵ y = 16 and x = -8

- Substitute y by 16 and x by -8 in the equation above

∴ 16 = k(-8)

- Divide both sides by -8

∴ -2 = k

∴ The value of k is -2

- Substitute the value of k in the equation above

∴ y = -2 x ⇒ equation of variation

∵ y = -14

- To find x substitute y by -14 in the equation of variation

∵ -14 = -2 x

- Divide both sides by -2

∴ 7 = x

∴ The value of x is 7

The value of x when y = -14 is 7

Learn more:

You can learn more about variation in brainly.com/question/10708697

#LearnwithBrainly

8 0

3 years ago

This monitor has a diagonal length of 19 inches and an aspect ratio of 5:4. What are the width and height of the monitor? Round

nasty-shy [4]

<em>Rounded to the nearest tenth of an inch the Witdth of the monitor is 14.8 inches while the Height of the monitor is 11.9 inches.</em>

<h2>Explanation:</h2><h2 />

The aspect ratio is defined as:

<em>"The proportional relationship between the width and height of an image"</em>

It is usually expressed in a mathematical language as:

$x:y \\ \\ x: \ Width \\ \\ y: \ Height$

So, it is true that:

$x:y=5:4 \\ \\ or: \\ \\ \frac{x}{y}=\frac{5}{4} \\ \\ \therefore x=\frac{5y}{4}$

In this case, we know that the monitor has a diagonal length (D):

$D=19in$

So, by Pythagorean theorem:

$D^2=361 \\ \\ 361=x^2+y^2 \\ \\ Since \ x=\frac{5y}{4}$

$D^2=361 \\ \\ 361=x^2+y^2 \\ \\ Since \ x=\frac{5y}{4} \\ \\ 361=\left(\frac{5y}{4}\right)^2+y^2 \\ \\ 361=\frac{25y^2}{16}+y^2 \\ \\ \frac{41}{16}y^2=361 \\ \\ y^2=\frac{261\times 16}{41} \\ \\ y=\sqrt{140.87} \\ \\ y=11.869in$

Finding x:

$x=\frac{5(11.869)}{4} \\ \\ x=14.836in$

<em>Finally, rounded to the nearest tenth of an inch the Witdth of the monitor is 14.8 inches while the Height of the monitor is 11.9 inches.</em>

<h2>Learn more:</h2>

Pythagorean Theorem: brainly.com/question/10182890

#LearnWithBrainly

5 0

3 years ago

Help me plsssssssssssssssssssssssssss

Margarita [4]

number 7 is as follows Answer: C18.9

Step-by-step explanation:

The perimeter is the length of the outline of a shape. To find the perimeter of a rectangle or square you have to add the lengths of all the four sides. so (5.65x2)+(3.8x2)=18.9 cm

5 0

3 years ago

Read 2 more answers

Please help me out!!!!!

Verdich [7]

Answer:the first one is t>35 second one is h>58

Step-by-step explanation: Kinda easy bro lol

7 0

4 years ago