The question is attached in the picture below. (University level)

(-0.9 -0.3 -0.3 -0.1)

Step-by-step explanation:

||u|| is the scalar magnitude of the vector,

given by the formula sqrt(u1^2 + u2^2 uN^2),

where (1 to N) are the dimensions of a vector.

In this case, we have a vector in R4,

Thus that will work out to be sqrt(81 + 9 +9 + 1) = sqrt(100) = 10

Multiply 1/10 to the vector to get the unit vector:

which is (-9/10 -3/10 -3/10 -1/10)

9.55 degrees.

step-by-step explanation:

the given angle is

1 cycle is equal to 2π radians. so 4π will be equal to two cycles.

5.166667π-4π = 1.166667π

hence, this angle goes a little more than negative x axis.

1.166667π-π= 0.166667π

hence, the reference angle is 0.166667π radians.

1 radian = 57.2958 degrees

now, in degrees, this should be equals to 9.55 degrees.

10

step-by-step explanation: