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The teeth of a hand saw can be approximated by the function y=zr+4+4sin(6:r}, 0333471", Where y cm is the vertical height of the teeth at a

please help me to understand this algebra question Screen Shot 2018-05-02 at 11.13.36 pm.png

Screen Shot 2018-05-02 at 11.13.36 pm.png

The teeth of a hand saw can be approximated by the function
y=zr+4+4sin(6:r}, 0333471", Where y cm is the vertical height of the teeth at a horizontal distance 5:: cm from the end of the
saw. Note: This diagram is representative only. (a) How far apart are the successive peaks of the teeth?
(b) How roan}r teeth does the saw have? Give reasons for your amen (c) Give the equation of the linear function which will touch the peak of each of the teeth of
the saw.

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