exam Maths Puzzle Numerical Ability

Please help.
Factor the trinomial.
16x^2 + 40xy + 25y^2

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exam Other Question

graph the line represented by Y=-3 THE COST OF A FIELD TRIP IS $280 PLUS $5 PER STUDENT. THE SCHOOL CAN SPEND AT MOST $500 ON THE FIELD TRIP. HOW MANY STUDENTS ARE ABLE TO GO ON THE FIELD TRIP?