book Maths Puzzle Numerical Ability

find logcos(pi/5)

thanks so much if you can help me

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book Other Question

Solve by graphing.

#1

x+y=4
x-y=8

#2

x+3y=12
2x-4y=4

#3

2x+y=1
x=2y+8

#4

3x-2y=-4
2y-3x=-2 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%?