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3 years ago

Alan has read 80% of a book. He has 4 more pages to finish. How many pages are there in the book?

Mathematics

2 answers:

KiRa [710]3 years ago

8 0

Answer:

20 pages

Step-by-step explanation:

If 100%-80%=4 pages

then 20%=4 pages (multipy both sides by 5)

100%=20

20 pages

maw [93]3 years ago

3 0

Answer:

20 pages

Step-by step:

4 pages = 20%

20(5)=100 so 4(5)= 100% of the book

4(5)= 20

the book has 20 pages.

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1/6 x 500 please help me :(

stiv31 [10]

1/6= 0.1666666666 x 500 = 83.3333

5 0

3 years ago

You are situated 300 feet from the base of Tower Glitz Plaza watching an external elevator descend down the side of the building

nordsb [41]

Answer:

18.66 ft/s

Step-by-step explanation:

The distance between you and the elevator is given by:

$h=\sqrt{x^2+y^2}$

The rate of change for the distance between you and the elevator is given by:

$\frac{dh}{dt}=\frac{dh}{dy}*\frac{dy}{dt}$

$-16=\frac{dh}{dy}*\frac{dy}{dt}$

$\frac{dh}{dy}=\frac{d}{dy} (\sqrt{x^2+y^2})\\$

Applying the chain rule:

$u=x^2+y^2\\\frac{dh}{dy}=\frac{d\sqrt u}{du} *\frac{du}{dy}\\\frac{dh}{dy}=\frac{1}{2\sqrt u} *2y\\\frac{dh}{dy}=\frac{y}{\sqrt {(x^2+y^2)}}$

Therefore, at x=300 and y = 500, dy/dt is:

$-16=\frac{y}{\sqrt {(x^2+y^2)}}*\frac{dy}{dt}\\-16=\frac{500}{\sqrt {(300^2+500^2)}}*\frac{dy}{dt}\\\frac{dy}{dt}=-18.66\ ft/s$

The elevator is descending at 18.66 ft/s.

7 0

3 years ago

Luke added 429 + 699 +314 and got 950.Is this sum reasonable?

trasher [3.6K]

No, it's not reasonable

6 0

3 years ago

Read 2 more answers

The heights of women aged 20 to 29 follow approximately the N(64, 2.82) distribution. Men the same age have heights distributed

ivann1987 [24]

Answer:96.97

Step-by-step explanation:

Given

mean height of women $\mu _w=64$

Standard deviation of height $\sigma _w=2.82$

mean height of men $\mu _=69.3$

Standard deviation of height $\sigma _m=2.71$

P $\left ( X$

P $\left ( \frac{x-\mu _w}{\sigma _w}\right )$

P $\left ( Z$

i.e. 0.9697=96.97 %

4 0

3 years ago

What are the possible values of x and y for two distinct points, (5, –2) and (x, y), to represent a function?

Arlecino [84]

Answer:

What are the possible values of x and y for two distinct points, (5,-2) and (x, y), to represent a function? The value of x can be:

A.) Any real number

B.) Any real number except 5

C.) Any real number except 5 and -2

The value of y can be:

A.) Any real number

B.) Any real number except -2

C.) Any real number except 5 and -2

7 0

3 years ago

Alan has read 80​% of a book. He has 4 more pages to finish. How many pages are there in the​ book?

Alan has read 80% of a book. He has 4 more pages to finish. How many pages are there in the book?