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3 years ago

Simplify the following expressio. -11x^2+10x-9x^2+6

Mathematics

1 answer:

butalik [34]3 years ago

6 0

The answer to this problem

-20^2+10+6

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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.

5 0

3 years ago

What is the value of y=4x-2 when x=3? When x=3, y=?

balu736 [363]

Answer:

y = 10

Step-by-step explanation:

$y = 4(3)-2$
$y = 12 - 2$
$y = 10$

Have a lovely rest of your day/night, and good luck with your assignments! ♡

~ ren ⚘

3 0

3 years ago

Read 2 more answers

Graph the image of the given triangle, reflected across the y-axis. Select the Polygon tool. Then, click the points of the trian

Triss [41]

Hi! I just took the test and the photo below is the correct answer. Hope this helps and have a great day :)

7 0

4 years ago

Select the correct answer. Factor the polynomial below. 4x^2-16 A. 4(2 - x)2 B. 4(2 + x)(2 - x) C. 4(x - 2)2 D. 4(x + 2)(x - 2)

Stells [14]

Answer:

The answer is D

4(x²-4)=4(x-2)(x+2)

6 0

2 years ago

The sum of two numbers is 14 one number is two less than three times the other. find the numbers

BigorU [14]

Answer:

The numbers are $10$ and $4$

Step-by-step explanation:

Let

x-----> one number

y----> the other number

we know that

$x+y=14$ ------> equation A

$x=3y-2$ -----> equation B

Substitute equation B in equation A and solve for y

$3y-2+y=14$

$4y=14+2$

$y=16/4=4$

Find the value of x

$x=3(4)-2=10$

8 0

3 years ago