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Ricardo ran the 400 meter race 3 times his fastest time was 54.3 seconds his slowest time was 56.1 seconds if his average time was 55.0 seconds what was his time for the third race

The equation x2 – 1x – 90 = 0 has solutions {a, b}. what is a + b?

Solve x+3y=6 and 4x-6y=6 by elimination . show work !