The pendulum on a grandfather clock moves with simple harmonic motion, according to the equation y = 7 cos 0.81t, where y is in centimetres and t is in seconds. Find the displacement when t = 23 s. Your calculator must be set to radians.​

she will sew have sewn five dresses   and be 1/3 done with the sixth one in an hour.

step-by-step explanation:

3/4 of an hour=45 mins

lucy makes 1 dress per 11.25 minutes

45 mins+11.25 mins=56.25 mins

60 mins- 56.25 mins=3.75 mins

3.75 mins is 1/3 of of 11.25 mins

therefore she the other 1/3 would be part of the hour and she will have sewn 5 dresses and begun the sixth.

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combine all like terms then its just a 2 step equation

the solution, from the graphing of the two lines, is (3,2), i.e., x = 3, y = 2.