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3 years ago

What does A equal: 3(6a+12)=9

Mathematics

2 answers:

melisa1 [442]3 years ago

5 0

Answer:

a = -3/2

Step-by-step explanation:

3(6a+12)=9

Divide each side by 3

3/3(6a+12)=9/3

6a+12 = 3

Subtract 12 from each side

6a+12-12 = 3-12

6a = -9

Divide by 6

6a/6 = -9/6

a = -3/2

Dvinal [7]3 years ago

3 0

3(6a+12)=9

distribute

18a+36=9

subtraction P.O.E.

18a=-27

division P.O.E.

a=-1.5

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15 of the books for sale at a bookstore store are hardcover. If this represents 12% of all books

spin [16.1K]

The right answer is Option C.

Step-by-step explanation:

Hardcover books = 15

This represent 12% of total books.

Let,

x be the total number of books, therefore,

12% of x = 15

$\frac{12}{100}*x=15\\0.12x=15$

Dividing both sides by 0.12

$\frac{0.12x}{0.12}=\frac{15}{0.12}\\x=125$

As, 15 of them are hardcover books, the remaining will not be hardcovers;

Remaining books = Total books - hardcover books

Remaining books = 125 - 15 = 110

115 books are not hardcover.

The right answer is Option C.

Keywords: division, percentage

Learn more about percentages at:

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3 years ago

What is the least common denominator of 1/5, 5/6, 1/3 ?

algol13

Hello.

5: 5, 10, 15, 20, 25, 30, 35, 40

6: 6, 12, 18, 24, 30, 36, 42, 48

3: 3, 6, 9, 12, 15, 18, 21, 24, 27, 30

Now, find the smallest number they all share.

If you're looking for a faster way, memorize the multiplication/ times table. It definitely helps, especially in advanced math.

Hope that helps!

Disclaimer: Always double check your answers with a reliable source, as mistakes can be made. Never use this, or any, platform to cheat.

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4 years ago

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