exam Maths Puzzle Numerical Ability

Given g(x) = 3x^2 - x + 7, find [g(a + h) - g(a)]/h.

a. 6a + 3h + 1
b. 6a + 3h - 1
c. 6a + 3h + 2
d. 6a + 3h -2
e. none of these

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Hi, Can you please help solve these two problems PLEASE!! I lost power in Texas due to the storm and had a hard time coming back. Today is my last day in the class and I need to two years ago a father was four times as old as his son. three years from now the father will be only three times as old as the son. How old is each at present?