What did I do wrong in these PCS211 questions? Please take your time to correct my mistakes carefully!

4. [0/2 Points] DETAILS PREVIOUS ANSWERS SERPSE10 3.3.P.006. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER Vector A has a magnitude of 35 units and points in the positive y direction. When vector B is added to A, the resultant vector A + B points in the negative y direction with a magnitude of 18 units. Find the magnitude and direction of B. magnitude -53 ? X Your response differs from the correct answer by more than 100%. unit(s) direction . counterclockwise from the +x-axis Need Help? Read It6. [1/2 Points] DETAILS PREVIOUS ANSWERS SERPSE10 3.3.P.010. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER An engineer designs a roller coaster so that a car travels horizontally for 152 ft, then climbs 127 ft at an angle of 32.0 above the horizontal. It then moves 127 ft at an angle of 46.0 below the horizontal. If we take the initial horizontal motion of the car to be along the +x-axis, what is the car's displacement? (Give the magnitude of your answer, in ft, to at least four significant figures and give the direction of your answer in degrees counterclockwise from the +x-axis.) magnitude 369.9026587 X The magnitude of the displacement is the length of the vector which goes from the starting point to the ending point. You will need to measure this distance, and multiply by your scale factor. ft direction 356.27 . counterclockwise from the +x-axis Need Help? Read It8. [1/3 Points] DETAILS PREVIOUS ANSWERS SERPSE10 3.4.P.026. MY NOTES ASK YOUR TEACHER PRACTICE ANOTHER A girl rides her bike 2.50 blocks west, 3.00 blocks north, and then 9.25 blocks east. (a) What is the girl's displacement? (Give the magnitude of your answer in terms of blocks and the direction in degrees north of east.) 3.9 X Let +x be east and +y be north, then determine the x- and y-components of the total displacement. The magnitude of the resultant displacement can be found using the Pythagorean theorem. blocks at 50.19 X The direction of the displacement can be found by taking the arctan of the ratio of the north-south (y) and east-west (x) displacements. north of east (b) What total distance (in blocks) does the girl ride? 14.75 blocks