exam Maths Puzzle Numerical Ability

For a test of 8 true/false questions,Maria was curious about the following if she would answer every question by guessing. Determine
A) The probability of getting the first three

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exam Other Question

For this question, we must find the revenue from the sale of x items given by R=50x. Does this ask to graph the equation only or do I need to solve this for x. And if so, how do I do it? A master painter can paint a house in M days and two workers require W1 and W2 days each to paint a house alone. If the master can work as fast as the two workers working together, write an expression for M in terms of W1 and W2.