4,756 rounded to the nearest thousand is 5,000.
(a)
Given:
is in xy plane and 
is in the direction of k.
|a|=6 units, |b|=3 and θ = 90°
|a × b| = |a| × |b| sinθ
= |a| × |b| sin90°
= 6 × 3 × 1
|a × b| = 18
(b)
Let 
is perpendicular to both 
.
In this case,
x-component of 
is positive.
y-component of is negative.
z-component of is zero.
Student B: 1/2 mile in 4 minutes:
Divide 1 mile 4 min
--------- by ------------
2 1
This comes to 1 mile 1 1 mile
-------- * --------- = ------------ or (1/8) mile per minute.
2 4 min 8 min
-
Answer:
A
Step-by-step explanation:
The two angles add up to 90 degrees
