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Gre4nikov [31]
2 years ago
7

Find the product of (x − 9)2 and explain how it demonstrates the closure property of multiplication. X2 − 81; is a polynomial x2

− 81; may or may not be a polynomial x2 − 18x 81; is a polynomial x2 − 18x 81; may or may not be a polynomial.
Mathematics
1 answer:
torisob [31]2 years ago
5 0

Answer:

should be C

Step-by-step explanation:

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A man ran 20 miles in 2 hours. Calculate the average time that it took the man to run each mile in minutes.
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Please help quick will give brainliest
Snowcat [4.5K]

25t means "25 times t" where t is some unknown number. It is a placeholder for a number.

To find what the number is, we undo what is happening to t. So we divide both sides by 25 to undo the operation "multiply by 25"

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25*t = 1125

25*t/25 = 1125/25 divide both sides by 25

t = 45

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<h3>Answer: 45</h3>

As a check, we can plug t = 45 into the equation and we should get the same value on both sides

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John, Johan, and Jonathan collect postage stamps. Johan and Jonathan have the same number of stamps. Two times Johan’s collectio
MrRissso [65]

The number of postage stamps in John’s collection is 27.

We have given that,

John, Johan, and Jonathan collect postage stamps. Johan and Jonathan have the same number of stamps.

<h3>What is an elimination method?</h3>

The elimination method is the process of eliminating one of the variables in the system of linear equations using the addition or subtraction methods in conjunction with the multiplication or division of coefficients of the variables.

Johan and Jonathan have the same number of stamps.

Let x be the Johan and Jonathan postal stamps.

Let y be the John postal stamps.

Two times Johan’s collection is eleven less than five times John’s collection.

2x = 5y - 11............(1)

Three times Jonathan’s collection is three less than seven times John’s collection.

3x = 7y - 3............(2)

Multiply equation 1 with 3

3(2x = 5y - 11)

⇒ 6x = 15y - 33.........(3)

Multiply equation 2 with 2

2(3x = 7y - 3)

⇒ 6x = 14y - 6.............(4)

Subtract equation 4 from equation 3

⇒ 6x - 6x = 15y - 33 - (14y - 6)

⇒ 0 = y - 27

⇒ y = 27

Hence, the number of postage stamps in John’s collection is 27.

Find more information about the elimination method here

brainly.com/question/13877817

#SPJ1

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