All categories

3 years ago

A car wheel has a diameter of 20 inches. About how far does the car wheel travel in one rotation?

Mathematics

1 answer:

Slav-nsk [51]3 years ago

5 0

Answer: distance travelled in one rotation is the circumference of the tyre.

a. 1 rotation=pi×20.8

=22×20.8/7

=65.37 approx

b.5 rotations is 65.37×5

=325.86 aprox

c. 30 rotations is 30×65.37

=1961.14 inches aprox

Step-by-step explanation:

You might be interested in

Simplify: 3(a-2)+4(3-a)-10

Neporo4naja [7]

Answer:

-a - 4

Step-by-step explanation:

3(a-2)+4(3-a)-10

3a - 6 + 12 - 4a - 10

-a - 4

3 0

3 years ago

Two cars travel at the same speed to different destinations. Car A reaches its destination in 17 minutes. Car B reaches its dest

Goryan [66]

Answer:

speed of car A =Speed of car B=0.8 miles/minutes.

Step-by-step explanation:

We are given that speed of car A is equal to speed of car B.

Also let car A travels x miles.

and car B travels y miles.

Car A reaches its destination in 17 minutes.

this means that speed of car A is given by: $\dfrac{x}{17}$ miles/minutes ( since speed is defined as the ratio of distance and time).

Car B reaches its destination in 32 minutes.

This means that the speed of car B is given by: $\dfrac{y}{32}$ miles/minutes

as speed of both cars are equal this means:

$\dfrac{x}{17}=\dfrac{y}{32}$ ------(1)

Also we are given Car B travels 12 miles farther than Car A.

this means $y-x=12$

$y=12+x$ ------(2)

on using equation (1) and (2) we have:

$\dfrac{x}{17}=\dfrac{12+x}{32}\\ \\32x=17(12+x)\\\\32x=17\times12+17x\\\\32x-17x=17\times12\\\\15x=122\times17\\\\x=13.6$

Hence the speed of car A is 0.8 miles/minutes ( since x/17 is the speed of car A)

Speed of car B=0.8 miles/minutes.

8 0

3 years ago

(x^2–x–4)multiplied by(x–5)

Sergio [31]

$(x-5)(x^2-x-4) =x^3-6x^2+x+20$

Step-by-step explanation:

Given polynomials are:

$x^2-x-4\\and\\x-5$

Both polynomials have to be multiplied. We will use distributive property for the said purpose

So,

$(x-5)(x^2-x-4)\\=x(x^2-x-4)-5(x^2-x-4)\\=x^3-x^2-4x-5x^2+5x+20$

Combining alike terms

$=x^3-x^2-5x^2-4x+5x+20\\=x^3-6x^2+x+20$

Hence,

$(x-5)(x^2-x-4) =x^3-6x^2+x+20$

Keywords: Polynomials, Multiplication

Learn more about polynomials at:

#LearnwithBrainly

7 0

3 years ago

camelback mountain has an elevation change of 1,264 feet. how many pennies would it take to make a stack that high ? make sure y

vredina [299]

Answer:

106,782,720

Step-by-step explanation:

84,480 pennies

There are 84,480 pennies in a mile. Yes, that is correct – 84,480 pennies! An interesting fact to know: 16 pennies laid side by side constitute 12 inches in length, or one foot, and since 5,280 feet equals one mile, that gives us 84,480 pennies in a mile.

84,480x1264=106,782,720

hope this helps!

Brainliest pls

Pls fully rate

Have a great day!

8 0

2 years ago

If y varies directly with x, and y=12 when x=3. Find y when x=13

Lunna [17]

Answer: y = 52
Explanation:
13/3=4 1/3
4 1/3 times 12 = 52

Ratio explanation
(Times 4 1/3) 12:3 (divided by 4 1/3
New Ratio- 52:13

3 0

3 years ago