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2 years ago

Three times a number minus 9 is equal to two times the number plus 7

Mathematics

2 answers:

maxonik [38]2 years ago

8 0

Answer:

n=16

Step-by-step explanation:

Make an equation

Three times a number minus 9–> 3n-9

Times means multiply, and minus means subtract

Equals two times the number plus 7–> =2n+7

Times means multiply, and plus means add

3n-9=2n+7

Solve for n, by getting n by itself

Subtract 2n from both sides

3n-2n-9=2n-2n+7

n-9=7

Add 9 to both sides

n-9+9=7+9

n=16

sergij07 [2.7K]2 years ago

7 0

Answer:16

Step-by-step explanation:

After writing it out, the equation should be 3n-9=2n+7. Put the variables on one side and the numbers on the other so it should look like 3n-2n=7+9 and the answer is n=16

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(6e-3f-3/4) in a equivalent expression

pashok25 [27]

Answer:

Step-by-step explanation:

(6e-3f-3/4) contains two terms which do not involve fractions and one fractional term (3/4).

We can safely remove the parentheses. Then:

(6e-3f-3/4) => 6e - 3f - 3/4

That is "an equivalent expression."

We could go further and create one equivalent fraction. Multiply the first two terms by 4/4, obtaining:

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2 years ago

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Ymorist [56]

Answer:

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Step-by-step explanation:

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2 years ago

Subtract 5x−2 from −3x+4 .

Elanso [62]

Answer:

-8x +6

Step-by-step explanation:

5x−2 from −3x+4 .

This means take the 2nd number and subtract the 1st

-3x +4

-( 5x -2)

----------------

Distribute the negative sign

-3x +4

- 5x +2

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-8x +6

5 0

3 years ago

6 = 4x + 9y ( what Y )

olasank [31]

Answer:

Step-by-step explanation:

6 0

2 years ago

Tickets to a school play are $4.50 for an adult and $3.00 for a student. If 300 tickets are sold and $1087.50 collected, how man

Kryger [21]

Answer:

<h2>125 tickets for an adult</h2><h2>and 175 tickets for a student</h2>

Step-by-step explanation:

$a-\text{number of the tickets for an adult}\\s-\text{number of the tickets for a student}\\\\(1)\qquad a+s=300\\(2)\qquad4.5a+3s=1087.5\\------------\\(1)\\a+s=300\qquad\text{subtstitute}\ s\ \text{from both sides}\\a=300-s\\\\\text{Put it to (2):}\\\\4.5(300-s)+3s=1087.5\qquad\text{use distributive property}\\\\(4.5)(300)+(4.5)(-s)+3s=1087.5\\\\1350-4.5s+3s=1087.5\qquad\text{subtract 1350 from both sides}\\\\-1.5s=-262.5\qquad\text{divide both sides by (-1.5)}\\\\\boxed{s=175}$

$\text{Put the value of}\ s\ \text{to (1):}\\\\a=300-175\\\\\boxed{a=125}$

3 0

2 years ago