exam Maths Puzzle Numerical Ability

Find the Inverse:

f(x)=( 1/2 )[ 10^(x-1)+5]

book answer: log(2x-10)+1

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exam Other Question

graph, identify the conic section, and find the domain and range of 2x^2+y^2=36 On the written portion of her driving test, Sara answered 84% of the questions correctly. If Sara answered 42 questions correctly, how many questions were on the driving test?