exam Maths Puzzle Numerical Ability

page30 #'s 1-18
textbook title:holt pre algebra
ISBN:0-03-069609-7

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exam Other Question

Indicate whether the problem is true or false but please shoe me how you got the answer cos(theta) = 1/sec(theta) does the inverse of f(x)= 3/x-9

become f^-1(x) = 3+9x/x