Question 3 (1 point) If A = 21 + 3j and B = 1 + 2j, what is A + B? 0 47+47 O + 0 51 + 3j O 37+53Question 4 (1 point) If A is any non-zero vector, a unit vector A means: O It is a vector with magnitude one in the same direction as vector A O It is a vector in the same direction as vector A with the same magnitude O It is a scalar of unit 1 O It is a vector with a magnitude of oneQuestion 5 (1 point) Express FH by combinations of the vectors a, b, and c. B A a D E H G O - b + c Oa+ b Oa-c O -bQuestion 6 (1 point) Which is a true statement? R' is referred to as the xy-plane, so for each of the x- and y-coordinates for any point on the plane are real numbers or {(x, y) where x and y are real numbers; O R' is referred to as the real number line, so for each of the x-coordinates for any point on the line is a real number or (x, where x is a real number; R' is referred to as three space, so for each of the x-, y-, and z-coordinates for any point in space are real numbers or {(x, y, z) where x, y and z are real numbers; O none of the aboveQuestion 7 (1 point) x = (1, 2, 3) and y = (0, -1, 5). Determine X + V. O (1, 3, -2) O (1, 1, 8) O (1, 3, 8 ) O (1, -1, 8)