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3 years ago

Electromagnetic waves do not require a medium, but can travel through one.

Mathematics

1 answer:

Dafna11 [192]3 years ago

3 0

Hello,

I believe it is true.

Hope this helped!

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Y= 5x -3 what does y=

irga5000 [103]

Answer:

Step-by-step explanation:

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3 years ago

PLEASE ANSWER THIS QUESTION ILL MARK YOU AS THE BRAINLIEST

Nat2105 [25]

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answer3

beacuse to find the x-intercept, substitute in 0 for y and solve for x .

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2 years ago

Read 2 more answers

A cylinder has diameter of 4ft and a height of 9ft. Explain whether halving the diameter has the same effect on the surface area

elena55 [62]

Answer:

See Below

Step-by-step explanation:

The surface area of cylinder is given by the formula:

$SA=2\pi r^2 + 2\pi r h$

Where

r is radius ( diameter is 4, so radius is 4/2 = 2)

h is height ( h = 9)

Lets find original surface are:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (9)\\SA=8\pi +36\pi\\SA=44\pi$

<u>Halving diameter:</u>

diameter would be 4/2 = 2, so radius would be 2/2 = 1

So, SA would be:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (1)^2 + 2\pi (1) (9)\\SA=2\pi +18\pi\\SA=20\pi$

<u>Halving height:</u>

Height is 9, halving would make it 9/2 = 4.5

Now, calculating new SA:

$SA=2\pi r^2 + 2\pi r h\\SA=2\pi (2)^2 + 2\pi (2) (4.5)\\SA=8\pi + 18\pi\\SA= 26\pi$

Original SA is $44\pi$ ,

Halving diameter makes it $20\pi$

Halving height makes it $26\pi$

So, halving diameter does not have same effect as halving height.

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3 years ago

Which expression is equivalent to 4 (x + 2)?

Drupady [299]

Answer:

4 x + 8

Step-by-step explanation:

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3 years ago

The first house on the street has a lawn that is 300 feet long. The second house

Ivanshal [37]

Answer: 450

Step-by-step explanation:

first house--300

second house--50

third house--50 x2=100

300+50+100=450

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3 years ago