Given the vectors v and u, answer a. through d. below. v= 7i- 5k u= i+j+k a. Find the dot product of v and u. u•v = Find the length of v. |v| = (Type an exact answer, using radicals as needed.) %3D Find the length of u. Ju| = (Type an exact answer, using radicals as needed.) b. Find the cosine of the angle between v and u. cos 0 = (Type an exact answer, using radicals as needed.) c. Find the scalar component of u in the direction of v. (Type an exact answer, using radicals as needed.)

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A: To find the component of a in the direction of b