exam Maths Puzzle Numerical Ability

Please help. What am I doing here?
In exercise 30, if f(x)= 4x-3, find the following:
f(-1)

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exam Other Question

Tickets for a ballet performance cost $14 for adults and $12 for students. If total receipts from the sale of 605 tickets were #8,390.00, how many adult tickets were sold? THANK YOU SO MUCH On July 7, a married couple borrowed $2,000 from a finance company so they could take a vacation trip. If the loan was for two months, and the company charged 10% exact interest, f