book Maths Puzzle Numerical Ability

solve for x in terms of the other variables
b(x-d)=c(x+d)

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book Other Question

Susie is making a mixture of acetic acid and water, which forms vinegar. If she has a mixture of 100ml of 2% acetic acid, how many ml of pure acetic acid should she add to produce The graph of the basic exponential function (y = bx) has
two distinctive characteristics:


a) having a y intercept of (0,1), and

b) having a horizontal asymptote of y=0.