exam Maths Puzzle Numerical Ability

Lane invested $14000 part at 15% and part at 2%. If the total interest at the end of the year is $1060, how much did she invest at 15%. Please help. What formula could I use?

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exam Other Question

log(1/3)27 3n-2(n-4)-9+n

solve they system using the substitutio method
x+9y=4
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identify domain of the function
-x2(squared)+3