book Maths Puzzle Numerical Ability

my questions is
solve m+9.35=2.73

my answer is m=-6.62
thanks for the help

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book Other Question

please help
How many arrangements of the letters in the word OLIVE can you make if each arrangement must use three letters?
please explain the answer
A)20
b)60
c)8*7*6*5*4*3*2*1 Hello,

I need help with a few problems i cant seem to work out for homework.

1:Solve for x: 9^x=3
2:Solve for x: 2^9x^-4=32
3:Solve for x: log10^7=log10x-log10^2

Thanks