exam Maths Puzzle Numerical Ability

Solve for x algebraically: 5^(2x)- 4(5)^x=-3

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exam Other Question

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x-4y=8 @ noon a train leaves bridgton heading east at 90 mi/h to cogsville, 450 mi away. at 12:15 p.m. a train leave cogsville heading west to bridgton at 100 mi/h. at what time will they pass each other?