exam Maths Puzzle Numerical Ability

what does -9<2b-13 equal

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One day the temperature at 1:00 a.m. was 44 f, and by 4:00 p.m. the temperature was 59 f. What was the hourly rate of temperature change? Still having a little trouble with linear cost functions. Question is:
A small family bakery specializes in baking cheesecakes. The fixed cost of production is $245, the marginal