$16.76 divided by 4 = $4.19 each gallon
So $4.19 x 7 gallons = $29.33
75,000 x 5 = 5 x 75,000
just multiply 75,000 by five, since there are 75,000 people who visit oer day, and the teacher is looking for people to visit in a five day period. Then just change the order, and voila!
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(-3x^2 - 5x + 1) + (8x^2 - 2x - 9)
1st remove the parenthesis
-3x^2 - 5x + 1 + 8x^2 - 2x - 9
then combine like terms
5x^2 - 7x - 8 is the final answer