book Maths Puzzle Numerical Ability

x^2-19x+90=0
Solve by using quadratic formula

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book Other Question

If log (base of 3) 8=1.8928 and log (base of 3) 2=0.6309, what is the value of log (base of 3) 16? Joanie wants to save $90 for a gift. She begins by saving $.25 the first week. Each week she saves three times as much as the week before. In how many weeks will she have saved at least $90?