Find volume and surface area

Answers

Answer 1

Volume of cone = (pi • r^2 • h)/3

If the diameter of the circle on the cone is 8 then the radius is 4.

V = (pi • 4^2 • 9)/3

V = 48pi in^3

Surface are of cone given radius.
= pi • r^2 + pi • r • square root of r^2 + h^2

A = 3.14 • 4^2 + 3.14 • 4 square root of 4^2 + 9^2

A = 16 • 3.14 + 4 square root of 97 • 3.14

A = 50.24 + 4 square root of 304.58

A = 50.24 + 69.81

A = 120.05

Related Questions

If interest is compounded semi-annually, which expression
represents the account balance in t years?

Answers

Answer:

The equation to represent the account balance in t years

[tex]A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{2t}[/tex]

Step-by-step explanation:

Given the compound interest equation

[tex]A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{nt}[/tex]

here

A represents Accrued Amount (principal + interest)

P represents Principal Amount

I represent Interest Amount

r represents the Annual interest rate

t represents Time Involved in years

n represents the number of compounding periods per unit t

As we are given that the interest is compounded semi-annually

i.e. n = 2

so substituting n = 2 in the equation

[tex]A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{nt}[/tex]

[tex]A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{2t}[/tex] ∵ n = 2

Thus, the equation to represent the account balance in t years

[tex]A\:=\:P\left(1\:+\:\frac{r}{n}\right)^{2t}[/tex]

BRAINLIEST! URGENT! Please help, if you explain how you got the answer, I WILL GIVE BRAINLIEST.

Answers

a triangle is 180 degrees, so if you do 180-34 is should equal 146, so b + c = 146°

It costs each barber at Denny Moe's Superstar Barbershop $125.50 to use one chair for the entire day. The average barber at Denny Moe's Superstar Barbershop earns an income of $345.25. What is the profit for the average barber at Denny Moe's Superstar Barbershop?
$219.75
$220.25
$460.75
$470.75

Answers

Answer:

A-219.75

Step-by-step explanation:

Answer:

$219.75

Step-by-step explanation:

The profit is the difference between the income and costs, which in this example would be $345.25 - $125.50 = $219.75

A rectangle made of squares is shown . The length of the side of each square is 1 cm create an equation to find the area of the rectangle. Move numbers an symbols to the lines

Answers

Answer:

See Explanation

Step-by-step explanation:

The rectangle is not shown. To solve this question, I'll make use of the attachment.

Apply the same steps, and you'll get the answer to your question.

From the attachment, we have:

[tex]Rows = 3[/tex]

[tex]Columns = 4[/tex]

Since the length of each square is 1 cm, then

[tex]Row = 3cm[/tex]

[tex]Column = 4cm[/tex]

So, the area is:

[tex]Area = Row * Column[/tex]

[tex]Area = 3cm * 4cm[/tex]

[tex]Area = 12cm^2[/tex]

Can anybody answer this question??

Answers

The answer is A

as the x+ 4 is when we replace x with 0

x=0

y=0+4

So the line of y must intersect at (0,4) coordinate

which is given as in A and should be a positive slope

You have been working with irregular figures. How is estimating area on a grid different from estimating perimeter on a grid? how do you explain?

Answers

Answer:

When estimating area, count the squares that cover the shape. When estimating perimeter, count the unit lengths that are around the shape.

Step-by-step explanation:

your welcome

Answer:

When estimating area, count the squares that cover the shape. When estimating perimeter, count the unit lengths that are around the shape.

Step-by-step explanation:

Credit to the guy above.

PLEASE HELPP
in the table, y is a linear function of x. what is the value of y when x=0

Answers

Answer:

Step-by-step explanation:

by the way i love your profile picture

The radius of a right circular cylinder is increasing at the rate of 7 in./s, while the height is decreasing at the rate of 3 in./s. At what rate is the volume of the cylinder changing when the radius is 17 in. And the height is 5 in.?

Answers

Answer:

1014.73 in³/s

Step-by-step explanation:

We know the volume of a cylinder, V = πr²h where r = radius of cylinder and h = height of cylinder.

Now, to find the rate of change of volume, we differentiate it with respect to time. So

dV/dt = d(πr²h)/dt

= πhdr²/dr × dr/dt + πr²dh/dh × dh/dt

= 2πrh × dr/dt + πr² × dh/dt

when r = 17 in, dr/dt = rate of change of radius = + 7 in/s, h = 5 in and dh/dt = rate of change of height = - 3in/s (negative since it is decreasing).

So, dV/dt = 2πrh × dr/dt + πr² × dh/dt

= 2π × 17 in × 5 in × (+ 7 in/s) + π(17 in)² × (- 3 in/s)

Answer:

a. 4 : 1

b. 2 students

c. 3 : 1

Step-by-step explanation:

a. There were 12 students who got a C and 3 students who got As. The ratio is therefore:

12 : 3

Take it to the lowest form by dividing both sides by 3:

= 4 : 1

b. There were 4 students with a D grade and 8 with a B. The ratio is:

= 4 : 8

Taken to the lowest form that would be:

= 1 : 2

This means that for every student receiving a D, 2 students received an A.

c. 12 students received a C and 4 students received a D. That ratio is therefore:

= 12 : 4

Take to the lowest form by dividing both sides by 4:

= 3 : 1

7. This year, the water in a reservoir dropped by 60%. For the original water level to be restored next year, by what percent must the remaining reserves increase?

Answers

Answer:

Given: Water in a reservoir dropped by 60%

Step-by-step explanation:

let the total water level of reservoir be 100.

then, in first year

the water reservoir dropped = 60% of 100

=[tex]\frac{60}{100}[/tex] * 100

= 60

therefore, total water level needed to be restored till next year= 100

remaining water level to restore till next year= 100-60

=40

percentage= [tex]\frac{40}{100}[/tex] * 100

=40%

please answer i will give brainliest and extra points!

Answers

Answer:

Esther's is more expensive

Step-by-step explanation:

2 dollars per soda

Brainly plss

A publishing company creates a book for young children. To find the number of pictures on the page, the book says to multiply the page number by 3 and add 1. She discovers this pattern:

Which would best complete the pattern?
A. 4 x 3 = 12, 4 + 12 = 16, 16
B. 4 x 3 = 12, 12 + 1 = 13, 13
C. 4 x 3 = 12, 12 = 3, 3
D. 4 + 3 = 7, 7 x 3 = 21, 21

Answers

Answer:

Step-by-step explanation:

B is the only choice that has both all of the steps, and all of the steps in the right order.

Answer:

Step-by-step explanation:

If f(x) = -x + 5 and g(x) = x^2, what is (g° (-1)?

Answers

Answer:

[tex](g\circ f)(-1)=36[/tex]

Step-by-step explanation:

We are given the two functions:

[tex]f(x)=-x+5\text{ and } g(x)=x^2[/tex]

And we want to find:

[tex](g\circ f)(-1)[/tex]

This is equivalent to:

[tex]=g(f(-1))[/tex]

So, evaluating f(-1) first, we acquire:

[tex]f(-1)=-(-1)+5=6[/tex]

Then by substitution:

[tex]=g(6)[/tex]

So:

[tex]=(6)^2=36[/tex]

Therefore:

[tex](g\circ f)(-1)=36[/tex]

Your answer is indeed correct.

Answer:

please refer to the above attachment.

36 is the right answer.

A store manager and stroke some new trainees that a book is priced at $21 winds up costing a customer $20.63 what does the tax is included which is the sale tax percentage

Answers

Answer:

1.76%

Step-by-step explanation:

Given

Original price of the book = $21

Price after sales percentage = $20.63

Discount = 21-20.63

Discount = $0.37

sale tax percentage = discount/original price × 100%

sale tax percentage = 0.37/21 × 100

sale tax percentage = 37/21

sale tax percentage = 1.76%

Hence the sale tax percentage is 1.76%

write this rate as a unit rate 1/7 1/14

Answers

Answer:

1/7in=1/14min

14/7in=min

2in=min

the rate is 2 inches per minute.

Step-by-step explanation:

Answer:

The answer is 2.

Step-by-step explanation:

First you have to change 1/7 divided by 1/14 like this: 1/7 times 14/1.

Second solve the equation, 1/7 x 14/1 = 14/7 = 2.

Thank you for reading this, I hope this was helpful.

Luke wants to reduce the area of his rectangular garden by one-fourth. The expression 1/4 lw can be used to represent this change. What is another way to write this expression?

Answers

Answer:

lw/4

Step-by-step explanation:

Area of a rectangle = length × width

= l × w

Area of a rectangle = let

reduce the area of his rectangular garden by one-fourth

= 1/4 * lw

= 1/4lw

What is another way to write this expression?

Another way to write the expression is

= 1/4 * lw

= lw / 4

The expression -320+15y represents a submarine that began at a depth of 15 feet below sea level and ascended at a rate of feet per minute. What was the depth of the submarine after 15 minutes?

Answers

Step-by-step explanation:

Given an expression that represents a submarine that began at a depth of 15 feet below sea level and ascended at a rate of feet per minute is as follows :

-320+15y

We need to find the depth of submarine after 15 minutes.

Put y = 15 in the above expression.

-320+15y = -320+15(15)

= -320 + 225

= -95

Hence, the submarine is below sea level at 95 feet.

math is hard im not sure for this

Answers

Answer:

c. 39 miles per hour

Step-by-step explanation:

If you look at the graph, each hour has a marking of an interval of 39, starting at (1,39).

(hope this helps-and math gets better)

Help please ............

Answers

Answer: 0.45

9514 1404 393

Answer:

32 = (x) +(2x -5) +(2x -3)

Step-by-step explanation:

The perimeter is the sum of the side lengths:

P = a + b + c

32 = (x) +(2x -5) +(2x -3)

This can be simplified to ...

32 = 5x -8

and solved to find x:

x = (32 +8)/5 = 8

Anyone know the answer?!

Answers

Using elimination method: x = -79/4 , y = -45/8

help im a transfer i dont understand this

Answers

Answer:

You can graph them on desmos and see which is a linear (literally looks like a line)

Step-by-step explanation:

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