exam Maths Puzzle Numerical Ability

Consider a 10- question true or false test.
Doreen has a 90% probability of answering each question correctly. What is the probability that Doreen will answer all 10 questions correctly?

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exam Other Question
A piece of property valued $25000 six years ago is now valued at $18000. What was the annual rate of depreciation in the value of the property to the nearest percent? Simplify the expression x(2-x) - x(3-x).