allisonlillian
30.01.2020 •
Mathematics
If the sales tax of an item is $11.90 & the item cost 390 before tax. what is the sale tax rate
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Ответ:
Step-by-step explanation:
A positive parabola is one that has a + sign out front or no sign at all (and the positive is understood). A positive parabola opens like a cup with a bottom. Therefore, the positive parabola has a min value. A negative parabola opens upside down, like a mountain with a peak. Therefore, the negative parabola has a max value.