exam Maths Puzzle Numerical Ability

6 1/2a for a=14
I have no clue how to do this problem.I am helping my son with his homework.We are doing evaluate the expressions.

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exam Other Question

One of the scientists derived the following equation for Pn, the size of the kangaroo population at the end of the nth week of their stay (P0 = 51 000).
Pn = Pn-1 + a - b(2.5)n-1 Please help me with the setup of this formula: Find four consecutive odd integers such that the product of -3 and the sum of the first and fourth is 30 less than 10 times the opposite of the third.