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kykrilka [37]
3 years ago
11

What is equivalent to the expression (x-5)(x+5)+ (x-1) (x+5)

Mathematics
1 answer:
riadik2000 [5.3K]3 years ago
3 0
2x(squared) + 4x - 30
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Mark and Don are planning to sell each other their marble collections at a garage sale. If Don has 1 more than 3 times the numbe
Volgvan

Answer: Mark has 28 marbles while Don has 85 marbles.

Step-by-step explanation:

Let x represent the number of marbles that Mark has.

Let y represent the number of marbles that Don has.

If Don has 1 more than 3 times the number of marbles Mark has, it means that

y = 3x + 1

The total number of marbles is 113. It means that

x + y = 113- - - - - - - - - - - - 1

Substituting y = 3x + 1 into equation 1, it becomes

x + 3x + 1 = 113

4x + 1 = 113

4x = 113 - 1 = 112

x = 112/4

x = 28

y = 3x + 1 = 3 × 28 + 1

y = 85

4 0
3 years ago
Solve: -3= 12x-5(2x-7)
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Answer:

x = -19

Step-by-step explanation:

-3= 12x-5(2x-7)

Distribute

-3= 12x-10x+35

Combine like terms

-3 = 2x +35

Subtract 35 from each side

-3-35 = 2x+35-35

-38 = 2x

Divide each side by 2

-38/2 = 2x/2

-19 =x

7 0
3 years ago
Write a number that is the same when rounded to the nearest hundred and ten
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202 because you can round it to 200
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Write the following numerals in words <br><br> 7,350,023<br><br> 200,463<br><br> 21,000,000
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1) Seven million three hundred fifty thousand twenty-three
2) Two hundred thousand four hundred sixty-three
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8 0
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Are there any answer choices??

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