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

given triangle ABC with a=10 A=13 and B=26 what is the lenght of c?
i hope you can help
thanks a bunch!
Prove The following identity:

The Sum of (n,k)*((m-n),(n-k)) with k = 0 to n =(m,n)

The Sum of N choose K times m subtract n choose n subtract k from k equal 0 to n is equal