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3 years ago

9

Am English class has a read the first 384 pages of their novel. If this is 75% of the entire book, how many total pages are in t

he novel?

1 answer:

Wewaii [24]3 years ago

3 0

To find the total amount of pages, you would first convert 75% into 0.75. Then you will subtract 0.75 from 1.00 to get 0.25. Then you multiply 384 x 0.25 to get 96.

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aivan3 [116]

Answer:

Case 1:

$AB = 30$

$BC = 50$

Case 2:

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Case 3: Not possible

Step-by-step explanation:

Given

See attachment for illustration of each case

Required

Find AB and BC

Case 1:

Using Pythagoras theorem in ANB, we have:

$AB^2 = AN^2 + BN^2$

This gives:

$AB^2 = 24^2 + 18^2$

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Take square roots of both sides

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To calculate BC, we consider ANC, where:

$AC^2 = AN^2 + NC^2$

$40^2 = 24^2 + NC^2$

$1600 = 576 + NC^2$

Collect like terms

$NC^2 = 1600 - 576$

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Take square roots

$NC = \sqrt{1024$

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Case 2:

Using Pythagoras theorem in ANB, we have:

$AN^2 = AB^2 + BN^2$

This gives:

$24^2 = AB^2 + 18^2$

$576 = AB^2 + 324$

Collect like terms

$AB^2 = 576 - 324$

$AB^2 = 252$

Take square roots of both sides

$AB = \sqrt{252$

$AB = 15.9$

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$AC^2 = AB^2 + BC^2$

$40^2 = 252 + BC^2$

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Collect like terms

$BC^2 = 1600 - 252$

$BC^2 = 1348$

Take square roots

$BC = \sqrt{1348$

$BC = 36.7$

Case 3:

This is not possible because in ANC

The hypotenuse AN (24) is less than AC (40)

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The correct answer is A. 2cm
18 2cm
---- = ----
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