exam Maths Puzzle Numerical Ability

Simplify the expression x(2-x) - x(3-x).

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exam Other Question

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? How do I find the solution set, given the replacement set:

5x + 2y = 5 [(2, -2), (2, -7), (5, -4), (3, -5)}