A xbox is marked down $75. If this is a 15% decrease, find the sale price?

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  $425

Step-by-step explanation:

After the decrease, the sale price is 100% -15% = 85% of the original price. Of course, the markdown is 15% of the original price. Then the ratio of sale price to markdown is ...

  (sale price)/(markdown) = (85%)/(15%)

  sale price = markdown × 85/15 . . . . . multiply by markdown

  sale price = $75 × 85/15 = $425

The sale price of the x-box is $425.

rounding to the nearest thousandth would be 452,000

the answer

b. they are parallel and will never intersect.