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=-4i
t=1 =(8.1-4)i+(-3.1^2+6.1)j
=4i+3j
∆r=(4i+3j)-(-4i)
=8i+3j
=√8^2+3^2
=√73
b. v=dr/dt
d(8t-4)i+(-3t^2+6t)j/dt
= (8)i+(-6t+6)j
t=1 = (8)i+(-6.1+6)j
=8i