exam Maths Puzzle Numerical Ability

16=5(1-x)

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exam Other Question

simplify:

(4x^3+x^2-3)-(-9x^3+5x^2-5)

thank you for your help A pizza parlor has a choice of 12 toppings for its pizzas. From these 12toppings, how many different 4-topping pizzas can be ordered? Assume that the order in which the toppings are listed does not matter.