exam Maths Puzzle Numerical Ability

a real life situation where a straight-line graph might be applicable and explain please

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One day, the temperature at 2:00 A.M. was 43�F, and by 3:00 P.M. the temperature was 56�F. What was the hourly rate of temperature change?

thanks Can somebody help me with this problem please? Simplify complex rational expressions:
2 + 3
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