book Maths Puzzle Numerical Ability

give domain, range, vertex, and axis

1. y=-2x^2+6x

2. x= -y^2+4y

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book Other Question

my question is on solving equations with variables on both sides A bus can be chartered for a fixed price by 30 students, if 10 students are added the cost of the charter remains the same but the cost per student is reduced by $2.00. What is the cost of the charter?