exam Maths Puzzle Numerical Ability

can someone check these for me thanks...
Problem #
Find the effective rate correspondin to the given nominal 18% compounded quarterly.

My answer: 19.2%

Problem #2
Find the

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exam Other Question
A few years ago Portland instituted a new area code of 971 so that more phone numbers could be assigned. How many seven-digit phone numbers can be formed using this area code if the only restriction is that the first number cannot be 0 or 1? Three new ink cartridges cost $9 less than 5 new cartridges. Write and solve for the cost of each cartridge