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3 years ago

How do you answer this question with workings

Mathematics

2 answers:

natima [27]3 years ago

4 0

I was going to write the same thing as the other person that answered.

Murrr4er [49]3 years ago

3 0

Answer:

$32.80

Step-by-step explanation:

Let f be the cost of a file, then a storybook costs 3f ( 3 times as much )

Then the difference in cost is

3f - f = 16.40, that is

2f = 16.40 ( divide both sides by 2 )

f = 8.20

The cost of a file is $8.20 and the cost of a storybook is 3 × $8.20 = $24.60

The total cost of the 2 items = $8.20 + $24.60 = $32.80

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3 years ago

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Step-by-step explanation:

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3 years ago

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daser333 [38]

Answer:

Step-by-step explanation:

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3 years ago

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Simplify the expression (2x − 9)(x + 6)

kenny6666 [7]

<u>Answer: </u>

Simplified form of given expression (2x – 9 )( x + 6 ) is $2 \mathrm{x}^{2}+3 \mathrm{x}-54$

<u> Solution: </u>

We need to simplify following expression.

(2x – 9) ( x + 6)

For sake of simplicity lets first assume 2x – 9 = A

So expression becomes A(x+6)

= Ax + A6

Now replace A by 2x – 9

= (2x – 9 ) x + (2x – 9 ) 6

$=2 \mathrm{x}^{2}-9 \mathrm{x}+12 \mathrm{x}-54$

On simplification, we get

$=2 \mathrm{x}^{2}+3 \mathrm{x}-54$

Hence simplified form of given expression (2x – 9 )( x + 6 ) is $= 2 \mathrm{x}^{2}+3 \mathrm{x}-54$

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3 years ago