exam Maths Puzzle Numerical Ability

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

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Thanks in advance for all your help. tine
b)

Given the above graph, identify the graph of the function (line, parabola, hyperbola, or exponential), explain your choice, and How many 2-digit numbers can be formed with the digits 1,2,3,4,5,6?