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6491.For what value of 𝑥 is the following matrix symmetric? [ 5 𝑥 3 𝑥 7 2 3 2 9 ]
6492.One nautical mile per hour is equal to how many knots?
6493.One mile is equal to how many kilometers?
6494.12 × 0.012 = ?
6495.If 500 kg of meat feeds 20 lions at a zoo for a week, for how many days will 200 kg of meat feed 14 lions?
6496.At 3:00 AM, the temperature was 13°C below zero, but by noon it had risen to 32°C. Therefore, the average hourly increase in temperature was ______?
6497.If (7^a) (7^b) = (7^c) (7^d), what is d in terms of a, b and c?
6498.If x - 4 = 11 , then the value of x - 8 is?
6499.In 7 years, Hyder will be twice as old as he was 8 years ago. How old is he now?
6500.If x + y = 6 , y + z = 7 , and z + x = 9 the average (arithmetic mean) of x , y and z is?