Two vehicles driving in the same direction, down a highway at 100 km/h. A passenger in the leading car sounds a 1000 Hz whistle. What frequency will a passenger in the following car hear?

△cde maps to △stu with the transformations (x, y) arrowright (x − 2, y − 2) arrowright (3x, 3y) arrowright (x, −y). if cd = a + 1, de = 2a − 1, st = 2b + 3 and tu = b + 6, find the values of a and b. the value of a is and the value of b is .

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Prove that quadrilateral is a rhombus.