5 would be the dependent variable because the number 5 depends on how many greeting cards are bought.
The real part is the real number, which in this case is the 8..
the imaginary part has the i attached to it, which is 4
4i is the imaginary part
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u hav egiven someone discount o f5% total is 580. 580×5÷100=29
580-29=551
The variable your solving for should be on the left side, so just flip it
c=a/b
It will be 2/5 ft long and 7/25 ft wide. 200•1/500=2/5
140•1/500=7/25