Find the angle between u = (8.- 3) and v = (-3,- 8) round to the nearest tenth of a degree.
a. 180
c. 0
b. 90
d. 450

Step-by-step explanation:

First you must calculate the module or the magnitude of both vectors

The module of u is:

The module of v is:

Now we calculate the scalar product between both vectors

Finally we know that the scalar product of two vectors is equal to:

Where is the angle between the vectors u and v. Now we solve the equation for

the answer is 90°

Whenever the scalar product of two vectors is equals to zero it means that the angle between them is 90 °

answer: all of the odd numbers were opened

the first person was the one that was opening all of the lockers. since one is odd, this causes all of the odd number lockers to be opened in the end.