exam Maths Puzzle Numerical Ability

How many 2-digit numbers can be formed with the digits 1,2,3,4,5,6?

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exam Other Question

Determine whether the following pairs are invers of eachother

a. f9x0=8x-7 and g(x)=x+8/7

b. f(x)= 1/x and g(x)= 1/x

c. f(x)= 2x+3/x-1 and g(x)=x+3/x-2
Please help. I struggle with these.
In 2000, the circulation of a local newspaper decreased from 3041 papers sold in January to 2326 papers sold in December. Find the percent of decrease.