I need help with these please

4. Simplify: 2(7 + 5j) - 11(-37) 5. Suppose a walrus is swimming stubbornly north at a velocity of 8.5 mph. However, he's swimming in a current that is going southwest at a velocity of 4 mph. a. Write the two velocities as vectors. (ie, find the components of each vector) b. What is the vector of his total progress? c. How fast is he moving, relative to a stationary observer? d. At what angle is the walrus traveling? Give it in terms of north of east, south of east, north of west, or south of west