exam Maths Puzzle Numerical Ability

Complete the ordered pairs for the equation y = 7x + 7.

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I could really use some help on this one. For the function f(x) = x� - 3x + 4 construct and simplify the difference quotient f(x) = [f(x+h) - f(x)]/h
Freeport Mc MoRan projects that in 2010 world grain supply will be 1.8 trillion metric tons and the
supply will be only 3/4 of world grain demand. What will world grain demand be in 2010?