exam Maths Puzzle Numerical Ability

An aircraft descends from an altitude of 1000 feet at the rate 120 feet per minute.

Write a function that represents the altitude of the aircraft after any give number of minutes

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I am not getting this can someone please help me with these two questions, if possible can you explain each step so that I understand how you get to the answer.
Use the functions Working on a logarithm problem but having difficulty. Thanks!

Find the value of x for both

log41=x

log3 x=5

on the log4, the four is just below the log. Hope that is clear enough.Thanks!