book Maths Puzzle Numerical Ability

Vern invested $11,000. Part was invested at 15% and part at 13%. If the total interest at the end of the year is $1,610, how much did he invest at 15%?

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book Other Question

find logcos(pi/5)

thanks so much if you can help me 4 points ( 2 for determining points and 2 for the graph)
Graph the following inequality and shade it.
4X + Y > 4 ( , ) ( , ) Please answer the question in words describing and not graphed.