Find sin(11pi/12) using the sum or difference formulas

Svetlana's hair is 4 4 centimeters ( cm cm) long. her hair grows 1 . 5 cm 1.5cm per month. svetlana wants her hair to be less than 1 6 cm 16cm long. write an inequality to determine the number of months, m m, svetlana can allow her hair to grow so that it is less than 1 6 cm 16cm long.

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Arectangle has a width of 5 cm and a length of 10 cm. if the width is increased by 3, how does the perimeter change?