Evangeline drove 500 km from Windsor to Peterborough 5 h 30 min. She drove part of the way to steady speed of 100 km/h and the rest of the way at 80 km/h. How far did she travel at each speed?

45

step-by-step explanation:

the answer is d

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step-by-step explanation:

assume that you have 3 different side lengths.   apply the pythagorean theorem here:   square each of the two shortest sides; call them a and b, so that their squares are a² and b².   also square the longest side, calling the result c².

now, if a² + b² = c² is true, the triangle is a right triangle; otherwise it is not a right triangle.