Y=0.5d-d I'm not sure what you're learning. But if you're learning how to write expressions is really depends on what expression you're trying to write
<em>In base four, each digit in a number represents the number of copies of that power of four. That is, the first digit tells you how many ones you have; the second tells you how many fours you have; the third tells you how many sixteens (that is, how many four-times-fours) you have; the fourth tells you how many sixty-fours (that is, how many four-times-four-times-fours) you have; and so on.
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Answer:
15
Step-by-step explanation:
if your multiplying it i think you are?
a neg. by a neg. is a positive
