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3 years ago

The sum of an unknown number and fifteen is decreased by eight. The result is two.

Mathematics

2 answers:

boyakko [2]3 years ago

6 0

Answer:

n+15 -8 =2

n=-5

Step-by-step explanation:

Let n be the unknown number

sum of an unknown number and fifteen

n+15

is decreased by eight

n+15 -8

The result is two.

n+15 -8 =2

Combine like terms

n +7 =2

Subtract 7 from each side

n+7-7=2-7

n=-5

I am Lyosha [343]3 years ago

4 0

Answer:

-5

Step-by-step explanation:

Let's call this unknown number x.

Then (x+15)-8=2. Therefore, x=2+8-15 = -5.

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Step-by-step explanation:

Let x represent the number of board-feet of lumber yards that is produced and sold in a day

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4 years ago

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AlladinOne [14]

Answer:

Step-by-step explanation:

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3 years ago

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Maria and Javier are taking a trip to a crafts store to buy supplies for an arts project. Maria buy 11 packs of ribbon and 16 ne

Umnica [9.8K]

Answer:

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markers: $0.08

Step-by-step explanation:

Each purchase will be the sum of products of item price and number of items. The two purchases give rise to two equations.

<h3>equations</h3>

The variables are defined in the problem statement. The two purchases are ...

11r +16m = 6.23

13r +7m = 6.41

<h3>solution</h3>

A calculator offers a simple way to find the solutions to these equations. The attachments show the solution to be ...

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The "cross-multiplication" method of solving these equations seems particularly useful when the coefficients are mutually prime. It starts with a rewrite to general form: