exam Maths Puzzle Numerical Ability

For the general cubic polynomial f(x)= ax^3 + bx^2 + cx + d (a different from 0).
Find conditions on a, b, c, and d to ensure that f is always increasing or always decreasing on (-00, +00).

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exam Other Question

compute the amount and the compound interest:

A) P=$6000 T=4yrs. R= 8.5% figure semiannyally
B) P=$3500 T=2yrs. R= 4% figure quarterly I cant figure this out

the number of students at westwood high school with a drivers license is 558. this is 24% more than last year. how many students had a drivers license last year.

THANKS