11. [-/1 Points] DETAILS SPRECALC7 12.3.068.MI. Determine whether the infinite geometric series is convergent or divergent. If it is convergent, find its sum. (If the series is divergent, enter DIVERGENT.) 3 + 9 + 27 + . 16 6413. [-/5 Points] DETAILS SPRECALC7 9.1.059. MY A pilot heads his jet due east. The jet has a speed of 400 mi/h relative to the air. The wind is blowing due north with a speed of 40 mi/h. (Assume that the i vector points east, and the j vector points north.) (a) Express the velocity of the wind as a vector in component form. (b) Express the velocity of the jet relative to the air as a vector in component form. (c) Find the true velocity of the jet as a vector. (d) Find the true speed of the jet. (Round your answer to the nearest integer.) mi/h Find the direction of the jet. (Round your answer to one decimal place.) N15. [-/1 Points] DETAILS SPRECALC7 7.2.055.MI. Evaluate the expression under the given conditions. cos(0 - 4); cos(0) = > 13 @ in Quadrant IV, tan(@) = -V3, @ in Quadrant II 16. [-/1 Points] DETAILS SPRECALC7 7.5.045. Use a Double- or Half-Angle Formula to solve the equation in the interval [0, 2x). (Enter your answers as a comma-separated list.) cos(20) + cos(0) = 2 8 =