exam Maths Puzzle Numerical Ability

help!
When I put this into my calculator it said "0"

solve for x

7e^5x=125
I put in 7 2nd Ln ^(5x)=125 (into a TI 83) what am I doing wrong?
What should the answer be?

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exam Other Question

a) Randolf bought a high-end computer system for $4800. The system depreciates at the rate of 25% each year.
Determine an exponential funciton to model the value of the system ov Can you please explain the steps. SOLVE AND GRAPH..

4x-7y=10
-3x+2y= -9