exam Maths Puzzle Numerical Ability

What are two variables that can be represented by a straight line graph?
Problem from book, Connected Mathmatics "Moving straight ahead"

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exam Other Question

Subtract -7x-5-2x^3from 4x^3-5x again another word problem..Fireworks are launched into the air. The quadretic function that models the fireworks' height, s(x), in feet, x seconds after they are launched is give