Answer: 15.539r-2.64
Step-by-step explanation:
For the given vectors
and 
The dot product of vectors a and b is defined as = 
So, 

= -16+12
= -4
Answer:
it is the second one, number zero does not have an opposite
Step-by-step explanation:
Before combining the real parts and the imaginary parts, line them up vertically as follows:
4 + 4i
-13 - 17i
-------------- Now add up each column.
-9 - 13i (Answer A)
To solve for the other leg, you need to use Pythagorean theory.
The theory states that C^2 = A^2 + B^2
In your case, you have to solve for B.
C = 40 (hypotenuse) A = 24 (leg 1)
The formula rewritten for B is

Now, you can solve.

Therefore, B = 32.
So the second leg is 32 feet.