book Maths Puzzle Numerical Ability

What is the inverse of the equation f(x) = -2x + 5?

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book Other Question

Find an orthogonal basis of the following subspace L = span (v1,v2,v3), where v1=(0,0,1,1), v2=(1,0,1,0), v3=(0,1,-1,-1) A woman deposits $50,000 in a savings account with 4% continuously compounded interest. How many years must she wait until the balance has doubled?