Remember: The formula for the period only cares about the coefficient, $$ \color{red}{a} $$ in front of the x. The formula for the period is the coefficient is 8 : $$ -7 cos (\color{red}{8}x) $$. $ period = \frac{2 \pi}{ \color{red}{a}} \\ period = \frac{2 \pi}{ 8} \\ period = \frac{ \pi}{4} $.
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Apple will be releasing three versions of the Apple Watch early next year, with the high-end model available in 18 karat gold. The company has announced a starting price of $349 for an entry-level Apple Watch, but has remained mum so far about how much the gold one will cost. According to the tech news site Tech Crunch, experts estimate it could retail for about $1200.