3 + -4 is the same as -4 + 3. (In the same way that 1 + 2 is the same as 2 + 1).
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2 + (3 + 4) is the same as (2 + 3) + 4. This means you can do the addition "in parts" for convenience. Example. 6 + 4 + 3 is the same as (6 + 4) + 3 is the same as 10 + 3 = 13
yes they are the same 4^3 = 4*4*4=64
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3 over 4 (3/4) is the same as 3 divided by 4. So, 3 divided by 4 = 0.75
3/4 divided by 4/3 is same as 3/4 times 3/4 ( invert the denominator) 3/4 x 3/4 = 9/16