book Maths Puzzle Numerical Ability

how to find the sum of n terms of sin a+sin 3a+sin 5a+...

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book Other Question

What is the x-intercept of the line with the equation 4x+2y=12?
This is a multiple choice A. (6,0) B.(0,3) C.(0,6) D.(3,0)
I am looking for help on this problem any help i would really be thankful

Elaine was charged $195 interest for 1 year on a $1000 credit card balance. What was the monthly interest rate?