Geometry i need help rn and could you tell me the name of this subject

Given:

Sum of the radius of the base and height of a cylinder = 21 cm

Curved surface area of the cylinder = 616 sq.cm

To find:

The total surface area of the cylinder.

Solution:

Let r be the radius of the base and h be the height of the cylinder.

Sum of the radius of the base and height of a cylinder = 21 cm

[tex]r+h=21[/tex]

[tex]h=21-r[/tex]           ...(i)

Curved surface area of the cylinder is

[tex]CSA=2\pi rh[/tex]

Curved surface area of the cylinder = 616 sq.cm

[tex]2\pi rh=616[/tex]

[tex]2(\dfrac{22}{7})r(21-r)=616[/tex]

[tex]44r(21-r)=616\times 7[/tex]

[tex]21r-r^2=\dfrac{616\times 7}{44}[/tex]

[tex]21r-r^2=14\times 7[/tex]

[tex]0=98-21r+r^2[/tex]

[tex]0=98-14r-7r+r^2[/tex]

[tex]0=14(7-r)-r(7-r)[/tex]

[tex]0=(7-r)(14-r)[/tex]

[tex]r=7,14[/tex]

Using (i), for r=7, h=14 and for r=14, h=7.

Total surface area of the cylinder is

[tex]A=2\pi r(r+h)[/tex]

For r=7 and h=14,

[tex]A=2(\dfrac{22}{7})(7)(7+14)[/tex]

[tex]A=44(21)[/tex]

[tex]A=924[/tex]

For r=14 and h=7,

[tex]A=2(\dfrac{22}{7})(14)(14+7)[/tex]

[tex]A=88(21)[/tex]

[tex]A=1848[/tex]

Therefore, the total surface area of the cylinder is either 924 sq.cm or 1848 sq. cm.

Answer:

Step-by-step explanation:

To convert square miles to square feet, multiply the square mile value by 27878400. For example, to convert 10 square miles to square feet, multiply 10 by 27878400, that makes 278784000 sq ft is 10 sq mi.

Answer:

the missing sign is for c) is <

Answer:

1st option, (2x, 2y)

Step-by-step explanation:

If we select any random point on Figure S, let's just say the upper right hand corner of the arrow at (2,3), and compare that to the same point but on Figure T, it is now (4,6). By just looking at the two points, we can see that the x and y values of the point we chose from Figure S had to be doubled to get to that point but in Figure T

Answer:

aaa

Step-by-step explanation:

Answer:

Answer:

you said you needed 22,23

22. y=7x-6

23. y=-x

Step-by-step explanation:

use math-way to put in the points

it explains for you

Step-by-step explanation:

Answer:

she won't have any money herself..?

Answer:

$5.10 For the 2 extra panes

Step-by-step explanation:

So 9 pained are 22.95

22.95/9=2.55

Since 2 panes are broken

2.55*2

that is 5.1

or $5.10

Answer:

$5.20

Step-by-step explanation:

First, we need to work out how much 1 pane is.

So $22.95÷9=$2.55

Then you times it by 2

So $2.55×2=$5.20

I hope this helps! :)

Answer: The price of the costume jewelry is 3 standard deviations to the left of the mean.

The price of the costume jewelry is 3 standard deviations to the left of the mean.

The mean (aka the arithmetic mean, different from the geometric mean) of a dataset is the sum of all values divided by the total number of values.

The price of the costume jewelry is 3 standard deviations to the left of the mean.

Learn more about Mean:

https://brainly.com/question/18060320

#SPJ2

Answer:

C. +4

Step-by-step explanation:

I calculated logically

Answer:

3/4

Step-by-step explanation:

While your image is blurry so it hard to, we know to find a slope we do rise (up)/run(Left) at section where they cross the dot. So i did this

Answer:

im not sure hehe

Step-by-step explanation:

power of a quotient?

Answer:

[tex]Adults = 510[/tex]

Step-by-step explanation:

Given

[tex]Children = \frac{3}{5}[/tex]

[tex]Girls:Boys = 2 : 7[/tex]

[tex]Girls = 170[/tex]

Required

Determine the number of adults

First, we need to calculate the number of children

[tex]Girls:Boys = 2 : 7[/tex]

Given that: [tex]Girls = 170[/tex]

Substitute 170 for Girls in [tex]Girls:Boys = 2 : 7[/tex]

[tex]170 : Boys = 2 : 7[/tex]

Convert to fraction

[tex]\frac{170}{Boys} = \frac{2}{7}[/tex]

Cross Multiply

[tex]Boys * 2 = 170 * 7[/tex]

Divide both sides by 2

[tex]Boys = \frac{170 * 7}{2}[/tex]

[tex]Boys = \frac{1190}{2}[/tex]

[tex]Boys = 595[/tex]

So, the number of children are:

[tex]Children = Boys + Girls[/tex]

[tex]Children = 595 + 170[/tex]

[tex]Children = 765[/tex]

Next, we calculate the number of people in the cinema.

[tex]Children = \frac{3}{5} * People[/tex]

Substitute 765 for Children

[tex]765 = \frac{3}{5} * People[/tex]

Make People the subject.

[tex]People = \frac{765 * 5}{3}[/tex]

[tex]People = \frac{3825}{3}[/tex]

[tex]People = 1275[/tex]

If 3/5 are children, then 2/5 are adults.

So:

[tex]Adults = \frac{2}{5} * 1275[/tex]

[tex]Adults = \frac{2* 1275}{5}[/tex]

[tex]Adults = \frac{2550}{5}[/tex]

[tex]Adults = 510[/tex]

Answer:

it's option is last one.

Subtract to eliminate y.

Hope it will help :)❤

Answer:

0.4, 4/9, 0.421, 3/7

explanation:

I'm pretty sure this is right if not let me know

Answer:

I don’t think its an equation cuase no equal sign so I’m assuming expression

Its already simplified the most

So the simplified version of this is 3c

Answer:

-15c+14

Step-by-step explanation:

(-9c+7)-(6c-7) (rewrite and remove the parentheses)

-9c+7-6c+ (collect the like terms and calculate)

solution: -15c+14

hope this helps!

Answer:

63 people prefer mashed potatos

Step-by-step explanation:

18 divided by 2 is 9

7 multiplied by 9 is 63

:)

Answer:

-$2.50

Step-by-step explanation:

Since it said that one stock fell $12.50,that means that the $12.50 is negative.Then you have to do -12.50 ÷ 5 which equals -2.50

Hope this helped!

Answer:

0.61596

Step-by-step explanation:

Given that:

λ = 5 (5 errors per page)

Poisson distribution formula :

P(x = x) = (λ^x * e^-λ) / x!

Probability that page does not need to be retyped means that error on page is less than or equal to 5

P(x ≤ 5) = p(x = 5) + p(x = 4) +... + p(x = 0)

The individual probabilities can be obtained using the formula above or the use of a calculator

P(x ≤ 5) = 0.17547 + 0.17547 + 0.14037 + 0.08422 + 0.03369 + 0.00674

P(x ≤ 5) = 0.61596

Answer:

1213 tablespoons

1 teaspoon

Step-by-step explanation:

This answer is my interpretation of what the question is asking, it could be wrong.

This question says, one has 2426 tablespoons, and 2 teaspoons of a substance. If one were divided that quantity in half, how much of that substance could they have. So essentially, all one needs to do is divided 2426 by 2, and divide 2 by 2.

2426 ÷ 2 = 1213

2 ÷ 2 = 1

Answer:2.8383838e+17

Step-by-step explanation:

Answer:

2.8383838e+17

Step-by-step explanation:

283838383838382828 + 838383838=2.8383838e+17

Answer:

60 minutes

Step-by-step explanation:

12 minutes * 5 miles= 60 minutes

Answer:

the answer is 1152

Step-by-step explanation:

Answer:

1,152!

Step-by-step explanation:

Hope it helps! <3

Answer:

=92^4 in think

Step-by-step explanation:

Answer:

Yes 1 is greater than -4

Step-by-step explanation: