Complex conjugate of 3+4i

The answer would be 7 because it’s addition.

Well if the girl sold the same number of larges but one less small and she made $5 less, then you know that the small boxes are $5. From there take the equation 2s + 7L =52 and subtract 10 from 52 (the two small boxes equal 10) You're left over with 7L= 42 so then do 42/7 = $6 per big box