All categories

3 years ago

1. The surface area of a cylinder is T=2rtrh+2tr2, where T is the surface area, andr

Mathematics

2 answers:

stellarik [79]3 years ago

6 0

Answer:

the surface area of a penny = 662.81 mm²

Step-by-step explanation:

got this correct in exam

kap26 [50]3 years ago

4 0

Answer:

the surface area of a penny = 662.81 mm²

Step-by-step explanation:

given:

A penny is a cylinder with a diameter of 19.05 millimeters

and a thickness of 1.55 millimeters.

find:

what is the surface area of a penny?

<u>surface area of a cylinder formula: </u>

As = 2 π r h + 2 π r²

let r = 19.05 / 2

r = 9.53 mm

let h = 1.55mm

plugin values into the formula:

As = 2 π (9.53) 1.55 + 2 π (9.53)²

As = 92.76 + 570.05

As = 662.81 mm²

therefore,

the surface area of a penny = 662.81 mm²

You might be interested in

PLEASE HELP ASAP!!! CORRECT ANSWERS ONLY PLEASE!!!

BabaBlast [244]

Hey!

Weight of small box = 5 lb. x no. of small boxes total weight = 5*x

Weight of Large boxes = 12 lb. y no. of large boxes total weight = 12*y

Total weight = 5x + 12y.

Since total weight carrying capacity of shelf is 80, thus the inequality becomes:

5x + 12y Less than or equal to 80.

(a) satisfies the inequality.

(b) satisfies the inequality.

Hope my answer helps!

7 0

3 years ago

Can somebody help me on this it is circumference and area of circles it shows everything in the photo whoever figures all of it

egoroff_w [7]

Refer to the attached image

7 0

2 years ago

How do u factor this

PilotLPTM [1.2K]

You can factor a parabola by finding its roots: if

$p(x)=x^2+bx+c$

has roots $x_1,\ x_2$ , then you have the following factorization:

$p(x) = (x-x_1)(x-x_2)$

In order to find the roots, you can use the usual formula

$x_{1,2} = \dfrac{-b\pm\sqrt{b^2-4ac}}{2a}$

In the first example, this formula leads to

$x_{1,2} = \dfrac{-2\pm\sqrt{4+4}}{2} = \dfrac{-2\pm\sqrt{8}}{2} = \dfrac{-2\pm2\sqrt{2}}{2} = 1 \pm \sqrt{2}$

So, you can factor

$x^2-2x-1 = (x-1-\sqrt{2})(x-1+\sqrt{2})$

The same goes for the second parabola.

As for the third exercise, simply plug the values asking

$f(1.5)=-5.25$

you get

$f(-1.5) = 1.5c-3 = -5.25$

Add 3 to both sides:

$1.5c = -2.25$

Divide both sides by 1.5:

$c = 1.5$

7 0

3 years ago

Megan is going to paint the front door of her house. In order to purchase the correct amount of paint, Megan needs to calculate

noname [10]

Answer: You need to calculate the Area because it is a space being occupied.

Step-by-step explanation:

7 0

3 years ago

Joe has 70 quarters and dimes. The total value is $14.40. how many quarters does he have

maksim [4K]

14*4=56+1 for the 40 cents = 57 is your Answer

6 0

3 years ago