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3 years ago

15

HELP WITH NUMBER 9 PLZ. HELPPPPPPPPPPPPPPP

1 answer:

Travka [436]3 years ago

7 0

2|3x-6|+4=44
2|3x-6|=44-4=40
|3x-6|=40/2=20
1) condition, when 3x-6 >= 0 or x>=2, then:
3x-6=20 -> 3x=20+6=26 -> x=26/3 it is >=2.
2) condition, when 3x-6<0 or x<2, then:
-3x+6=20 -> -3x=20-6=14 -> x=-14/3 it is <2.
So, we have two roots: x1=26/3=8.66666.. and
x2=-14/3=-4.66666..

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Given:

Price of gold in 2001 = (0.5x+300)

Its price tripled in 2008 and then doubled in 2011. In 2016, its price dropped to $\dfrac{2}{3}$ of the price in 2011.

To find:

An expression for the price of gold per ounce in 2016.

Solution:

We have,

Price of gold in 2001 $= (0.5x+300)$

Its price tripled in 2008.

Price of gold in 2008 $= 3(0.5x+300)$

Then doubled in 2011.

Price of gold in 2011 $= 2\times 3(0.5x+300)$

In 2016, its price dropped to $\dfrac{2}{3}$ of the price in 2011.

Price of gold in 2016 $=\dfrac{2}{3}\times 2\times 3(0.5x+300)$

$=2\times 2(0.5x+300)$

$=4(0.5x+300)$

$=4(0.5x)+4(300)$

$=2x+1200$

Therefore, the required expression for the price of gold per ounce is (2x+1200).

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Step-by-step explanation:

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where a , b , c are constant

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