yi - yi y2 - Yı x3 - xỉ X2 - X1 Assume x, # x, and x† # x3.

Let u4 be a linear combination of {u₁, U₂, U3 }. Select the best statement. A. We only know that span{u₁, U₂, U3} C span{u₁, U₂, U3, U4 } . B. There is no obvious relationship between span{u₁, ₂, u3} and span{u₁, U₂, U3, U4 } . © C. span{u₁, U₂, U3 } = span{U₁, U₂, U3, U4 } . © D. span{u₁, U₂, U3 } = span{U₁, U₂, U3, U4} when u4 is a scalar multiple of one of {u₁, U₂, U3}. E. none of the above

I thought at least meant greater than or equal to. Therefore the correct answer should have been A with the solid line

(c) √ z²dx-zdy+2ydz; C: the line segments from (0,0,0) to (0,1,1), from (0,1,1) to 77 (1,2,3), and from (1,2,3) to (1,2,4). (ans: 6