book Maths Puzzle Numerical Ability

a^2-9ab+81b^2

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I need more help on these please. you solvers are great!
Can you solvers also tell me if these problems are POLYNOMIALS, LINEAR, PARABOLA, TRINOMIALS, BINOMIALS, QUADRATIC EQUATI
A moving van leaves a house traveling an averge rate of 30 miles per hour.The family leaves the house 3/4 hours later following the same route in a car. They traveled at an averge