exam Maths Puzzle Numerical Ability

Craig purchases a book and an audiocassate of another book. The total cost is $36.00. The book costs $9.00 more than the audiocassette. How much does each item cost?

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exam Other Question

Debbie has 80 metres of fencing to make a rectangular dog pound of dimensions length ,L,and width, W. What is the equation of the area of the dog pound as a function of length? 3^x=40

e^0.04t=1500

please help me solve these... if possible...i need good step by step process