book Maths Puzzle Numerical Ability

Considering a logarithm being an
exponent, what would logb(ba) equal?

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book Other Question

Perform the following complex number multiplication and write the answer in standard form:

(2 - i)(-6 + 6i) Lisa wants to sell her car through a broker who charges a 10% commission of the selling price.Blue book is $14,900 but Lisa still owes $13,104.Lisa must get enough money to at least pay off the loan. What is the range of the selling price?