There is 20 percent profit
Okay in scientific notation you put the decimal behind the first number so in this case it would be 3.5 now count the decimal places you moved there are 3 and it is negative because the decimal was Infront of the number so .0035 is 3.5×10^-3 in scientific notation.
If you add it all together it will be 180 so to work it out you would do this...
7x+40=180
7x=140
x=20
hope this helps :)
Step-by-step explanation:
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