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Dmitry [639]
3 years ago
10

A study was being conducted about how much college students spend on the purchase of their textbooks.

Mathematics
1 answer:
Mandarinka [93]3 years ago
5 0

Answer:

n=4

Step-by-step explanation:

because 4x10=40

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50 centimeters times blank = blank pounds
slava [35]

Answer:

0.11

Step-by-step explanation:

I found that out by multiplying the centimeters by pounds

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Prove the identity.
Delvig [45]

Answer:

D. Pythagorean

Step-by-step explanation:

Given the identity

cos²x - sin²x = 2 cos²x - 1.

To show that the identity is true, we need to show that the left hand side is equal to right hand side or vice versa.

Starting from the left hand side

cos²x - sin²x ... 1

According to Pythagoras theorem, we know that x²+y² = r² in a right angled triangle. Coverting this to polar form, we have:

x = rcostheta

y = rsintheta

Substituting into the Pythagoras firnuka we have

(rcostheta)²+(rsintheta)² = r²

r²cos²theta+r²sin²theta = r²

r²(cos²theta+sin²theta) = r²

(cos²theta+sin²theta) = 1

sin²theta = 1 - cos²theta

sin²x = 1-cos²x ... 2

Substituting equation 2 into 1 we have;

= cos²x-(1-cos²x)

= cos²x-1+cos²x

= 2cos²x-1 (RHS)

This shows that cos²x -sin²x = 2cos²x-1 with the aid of PYTHAGORAS THEOREM

5 0
3 years ago
Henry is an avid reader.He devours 90 pages in half-an-hour.How many pages has Henry read per minute?
ICE Princess25 [194]

Answer:

3 pages per minute

Step-by-step explanation:

Half an hour is eqquivalent to 30 minutes, so we do 90 (pages) / 30 (minutes) = 3--> Wich means that Henry can read 3 pages per minute.

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Which of the following numbers could not possibly be a​ probability? Justify your answer. 0.123 negative 0.577 0 What must be tr
dusya [7]

Answer:

First question: -0.577 cannot be a probability.

Second question: The number must be between 0 and 1, inclusive (D)

Third question: -0.577 cannot be a probability.

Step-by-step explanation:

A probability is a real number that is in the interval [0, 1]. Therefore, any number outside this range cannot be considered a probability. Under this premise:

First question: -0.577 cannot be a probability.

Second question: The number must be between 0 and 1, inclusive (D)

Third question: -0.577 cannot be a probability.

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According to an article in Marketing News, fewer checks are being written at the grocery store checkout than in the past. To det
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I dont know man...im tryna answer questions so i can ask mine :(
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