For this case we have the following vectors:
v = (4, -3, 5)
w = (2, 6, -1)
We want to calculate the following operation:
u = 0.75v + 0.25w
We have then:
u = 0.75 (4, -3, 5) + 0.25 (2, 6, -1)
Rewriting we have:
u = (3, -2.25, 3.75) + (0.5, 1.5, -0.25)
u = ((3 + 0.5), (-2.25 + 1.5), (3.75-0.25))
u = (3.5, -0.75, 3.5)
Answer:
u = (3.5, -0.75, 3.5)
option C