exam Maths Puzzle Numerical Ability

Find A intersection B, given A = {0, 1, 2, 4} and B = {0, 1, 3, 4}.

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I AM SO CONFUSED. I HAVE A GRAPH THAT I NEED TO FIND THE SLOPE.
IT HAS A STRAIGHT ARROW GOING UP PASSING THROUGH 0 AND 5?? THANKS The lengths of the sides of a non-right triangle are 17 inches, 9 inches, and 12 inches. Find the area of the triangle. Round to the nearest tenth.
my answer is 17 * 9 + 12 = 165 / 3 = 55