Answer:
OB. the assets used to secure a loan
Step-by-step explanation:
You use collateral to decrease the risk for the bank. It can be like a car, or house. If you don't pay them back, they take the car or house.
B) is correct
a=-4
b=9t
(a+b)(a-b)=a^2-b^2=16-81t^2
C=15+3. Combine like terms. C=18.
If we take the equation and multiply out the left side, we get....

+ 2xk +

=

+ x +

The x^2 and k^2 cancel out on both sides leaving us with this...
2kx = x
If we divide both sides by 2x to isolate k,
k ends up = 1/2