exam Maths Puzzle Numerical Ability

find the mean -6,-2,1,9,11,17

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exam Other Question

Tim went to buy a car and found the prices depreciates in value.The following table shows the average price of the car based on the year of the car.
Age of car(in years)---New , 1 Polynomials

p(x)+4 q(x)If P9x)=3x^5+70x^3-67x^2+3 and q(x)=3x^3+56x^2-19