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What is last year of decade 1999 or 2000?
Given that there was no year 0, the first decade would have been from year 1 to year 10 (inclusive). Adding ten-year intervals would lead to the result that the last year of the decade was 2000 and not 1999. However, that is the view of a purist mathematician - something of a minority view.
What was the last decade of the nineteenth century called?
It was called the 1890's (Eighteen-nineties) It was called the 1890's (Eighteen-nineties)
Is this true or false the activity of a volcano may last from less than a decade to more than 10 million years?
true
Was the year 2000 really a part of the 1990s decade seeing as there was no year zero?
No, 2000 was not part of the 1990s. The 90s were all the years from 1990 to 1999. The fact that the decade finished in 1999, is one of the reasons people thought it was the end of the 20th century. A decade is a period of 10 years. We often think of them in terms of a second last digit the years start with, like the 80s, 90s etc. This means the decades as we think of them are 1 year out of synch with a standard 1 to 10 type of decade. In truth a decade can be any period of 10 years, so 1994 to 2003 was just as much a decade as 1990 to 1999 or 1991 to 2000.
What is a figure that is not changed by a horizontal reflection or a translation?
No figure is changed by a translation so the last part of the question is irrelevant. Any figure with a horizontal line of symmetry will not be changed by a horizontal reflection.
