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Zinaida [17]
2 years ago
14

Catherine paid $185.30 for an MP3 player. If the price paid includes a 9% sales tax, which of the following equations can be use

d to determine the price of the MP3 Player before tax? (Let x represent the cost of the MP3 player and y represent the total cost after tax.)
Mathematics
1 answer:
Wittaler [7]2 years ago
8 0

y = $185.30

x = the orignal cost minus 9% or .09. To increase an objects value by 9% you need to multiply by 1 + .09 or 1.09. So, x being increases by 9% would equal y or $185.30

1.09x = y

1.09x = $185.30

Divide both sides by 1.09

x = $170

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Step-by-step explanation:

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Her range was 10.  The range is found by taking the highest score and subtracting it from the lowest score.  The highest score had to be greater than 98 and the lowest score had to be less than 98 since we know the mode was 98.

Her mean score was 100.  This mean is found by adding all the numbers together and then dividing by the total numbers listed.  Adding the four scores together and dividing by 4 will equal 100.

Used guess and test:

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We can put it together: 
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