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This is assumed to be a 'rise over run' scenario. The 1 would be the rise, and the 15 would be the run. That is to say that for every 15(insert units here) run, or length, you will have 1 rise(insert unit here) or height.
An example of qualitative data is; This is a very big (insert object here) or, for quantitave data, This (insert object here) is as long as (insert exact length here) or, This (insert object) weighs (insert exact number of pounds, ounces, etc.) I hope that helps!
Here's your problem: 3004 - 2106 = 898.
Five minus seven is negative two. Here's a trick: switch the numbers around and then take your answer. Give it a minus sign.
64 This is just like regular multiplication but you have to pay attention to the signs. Here's a table that will help you determine what the sign of the answer should be: + x + = + + x - = - - x + = - - x - = +