book Maths Puzzle Numerical Ability

i dont know how to solve this problem...x-1=3
x+4=4

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Debit-card transactions. The total volume (in US dollars) of debit card transactions was $8.2 billion in 1990. In 1999, the total was $157.9 billion. Find the average rate of change in total debit card transactions from 1990 to 1999. Is this corect:if rank of matrix A is <= n-2 than rank of adj(A)=0