exam Maths Puzzle Numerical Ability

How can I write the expression 2.1n x-1n y+3. 1n z as a single lograithm. The periods after the 2 and 3 stands for the (times) sign not periods.

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exam Other Question

Sarah needs to borrow $1500 for her school tutition. She borrows the money on a six monthe short term note that charges simple interest. After 6 months, she owes $90.00 in interest. What is the simple interest rate being charged on this note? 4-(X/X-2)=(-2/X-2)