book Maths Puzzle Numerical Ability

Find slope given the following points: (2.5) and (2.1)

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book Other Question

evaluate eachof the following if a=3 and b=4.
(a-b)4 (3-4)3=-1 =3
Each person must finish a 110-item test in 90 minutes. How much time(in seconds) should be spent in each test item to be able to complete the test in the time allotted?