exam Maths Puzzle Numerical Ability

Simplify
(5^3)^-8
Type exponential notation with positive exponents

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exam Other Question

Janet invested $29,000, part at 12% and part at 14%. If the total interest at the end of the year is $3,800, how much did she invest at 12%?

I am having a terrible time setting up this problem... 20 stamps were sold for $6.62. Some stamps were 24 cents and some were 37 cents. How many of each stamp were sold?