exam Maths Puzzle Numerical Ability

Consider the following formula:

a = 1 b - 4
-
2

which of the following statements is true for this formula?

A. When the value of b is less than 8, a is negative.

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exam Other Question

1/3(4j+2k-6j+3k) How do I find the pattern to the sequence?
1,4,9,1,6,2,5,3,6,4,9,6,4 _,_,_,_
I would also like and explanation how to get the answer so I can explain it to my daughter.