exam Maths Puzzle Numerical Ability

log base2 x - 3 = log base 2(x-2)

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Not sure if this goes here but I really need help. Thanks!

A certain type of bacteria grows according to the function
f(t)= 5000e^.4055t, where t is measured in hours. What will the population be in 9 hours?

Thanks for any assistance. You invested money on two stocks paying 8% and 10% annual interest, respectively. At the end of the year, the total interest from these investments was $940. How much was invested