Express u= (15,46) as a linear combination urv + sw, where v (3,9) and w(4.13). (Use symbolic notation and fractions where needed.) Suppose that ABCD is a parallelogram, and A = (-5,8), B = (-4,b), C = (-2,10), D (a.7). What are the coordinates a and b? (Use symbolic notation and fractions where needed.) Find the vector parametrization r(t) of the line that passes through the points (1.4,2) and (3,8,7). (Give your answer in the form (,,*). Express numbers in exact form. Use symbolic notation and fractions where needed.)

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