exam Maths Puzzle Numerical Ability

there are 3 roads connecting town A and B, and 4 roads connecting towns B and C. how many different routes are there from town A to town C?

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x over x^2+2x+1 + 1 over x^2+5x+4=

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Thank you in advance for helping me with writing this problem in interval notation. t-1/t-5<=2