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if sin data =2/5 what is the exact value of cos 20?

I think i am really stuck on angles and i really need an online tutor

http://www.flickr.com...mysterious-midnight/ theres the two questions please help

dimmsdale discount golf supply sells titleist golf balls for 60c each, the nike golf balls for 94c each and the Calloway golf balls for $1.10 each. A golf pro bought two dozen more titleist golf balls than calloway golf balls and three times as many nike golf balls as titleist golf balls. if the golf balls and one dollar's worth of tees cost $140.50, how many golf balls of each kind were bought?

my question is- "A around wave of frequency 220 Hz travels along a steel bar. Its wavelength is 25 m. How fast is the wave travelling?"

1/8 (5y + 64) = 1/4 (20 + 2y)

I am sure I have failed my maths GCSE exam. Is it worth retaking them? Is not having maths such a bid deal when you apply for jobs