book Maths Puzzle Numerical Ability

please help....
A line in the Cartesian plane passes through the points (1,3) and (5,4). What is the slope of the line?

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book Other Question

t2 + 3t -8 =0 Can someone help me with this problem?

If a person jogs at a rate of 5 1/2 mi/h for 3 1/2 h. in a week, how many calories do they burn? (Calories per hours is 740)

Thanks,
Sher