exam Maths Puzzle Numerical Ability

I need help with to simplify these: e^lnx^3 and e^ln x^16 thanks

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exam Other Question

factor(x^2+3x-40) d...ch5

Problem #5

Simplify:
(3)/(4) divided by (4)/(5)


Problem #6
Divide:

(x^2+2x-15)/(4x^2) divided by (x^2-25)/(2x-10)


Problem #7

Solve:

(x)/(x-9) -4=