exam Maths Puzzle Numerical Ability

find the slope of the line passing through (3,4) and (3,-4)

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A tire manufacturer wishes to investigate the thread life of its tires. A sample of 10 tires driven 50,000 miles revealed a sample mean of 0.32 inches of thread remaining with a s Could someone please help me understand & solve this problem.
Let A={-3,-2,-1,0} Let B={0,1,2,3} Find A U B
Thank you.