The cost of hiring a surfboard involves an up-front fee plus an hourly rate. Three hours of hire costs $50 and 7 hours costs $90
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So.. checking the picture below
we can say y = y, or just do a substitution and end up with
once you know, how long is "x", then you can simply use the cosine of 72° to get "r"
thus
we can say y = y, or just do a substitution and end up with
once you know, how long is "x", then you can simply use the cosine of 72° to get "r"
thus