Question

How many times does your heart beat during your lifetime? round the answer to the nearest power of 10 and then express your answer as the order of magnitude. for instance, if your estimated answer is 3×105, enter 5. if your estimated answer is 8.7×105, you should enter 6 (rounding up to the next power of 10)?

Answer 1

North component: y = 15.0 m * sin 55.0º = 12.3 m West component: x = 15.0 m * cos 55.0º + 7.00 m = 15.6 m 
so his heading, measured from West, is Θ = arctan(y/x) = arctan0.787 = 38.2º N of West 
and measured from North is φ = arctan(x/y) = arctan(1.27) = 51.8º W of North 
Hope this helps!