exam Maths Puzzle Numerical Ability

4. Perform the indicated operations:
(5x2 - 3x + 2) + (-3x2 - 5x - 8) - (x2 + 3x - 10)

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The question said to say what p is but i really dont know how to sole it

3/8+p/8=25/8 1. Some students planned for a get-together. The budget for food was $500. Five of the students failed to come because of the distance and therefore the cost of food for each member increased by $5. How many students attended the get-together?