book Maths Puzzle Numerical Ability

f(x)=3^X, find the value of X that makes f(x)=17, then explain how you know the answer must be between 2 and 3

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book Other Question

Solve for x:

ln(7-x)+ln(3x+5)=ln(24x)
when x^3 + 3x^2 - 2x + 7 is divided by x + 1, the remainder is
a. 7
b. 8
c. 9
d. 11
e. 13