book Maths Puzzle Numerical Ability

a sudent is walking 70000 by 50 south of north ....what is the vector?

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MY ASSIGNMENT SAID FOR ME TO WRITE AN EXPRESSION FOR EACH QUANITY.
tHE FIRST PROBLEM READS; 1. THE VALUE IN CENTS OF 5 QUARTERS. I BELIEVE THE ANSWER IS THE FOLLOWING. 25+25+25+
The amount A in an account after t years from an initial principle P
invested at an annual rate r compounded continuously is given by A
= Pe^rt where r is expressed as a decimal.