Find the arc length parameter along the given curve from the point where t=0 by evaluating the integral ​s= ∫ v(ι)dι. Then find the length of the indicated portion of the curve. r(t)= (4+5t)i +(8+2)j +(2-7)k, -1 t<= t <=0

1. 2. ∠b and ∠y are right angles. 3.? 4.? which two statements are missing in steps 3 and 4? ∠x ≅ ∠c △abc ~ △zyx by the sas similarity theorem. ∠b ≅ ∠y △abc ~ △zyx by the sas similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem. = 2 △abc ~ △zyx by the sss similarity theorem.