17. All
18. B because it can be symmetrical either way
Each interior angle = 540/5= 108
If Jimmy's new cell cost him $49.99 with a 75% discount, then $49.99 is <span>100%−75%=25%</span><span> of the original price.
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The original price of the cell phone was <span>$199.96</span><span>.</span>
There are three negative signs so the product will be a negative.
hope this helps
