The easy answer: If, say, B is the zero matrix, i.e.

then

Since you don't have the picture, I can explain how to do the problem. Then, you can select the correct answer.
To find the area of a parallelogram, you must multiply the base times the height. If you have those 2 values, just multiply them and you will be done.
Answer:
"undefined"
Step-by-step explanation:
Slope is computed as "rise/run." For the given points, the rise is 7, but the run is 0, so the rise/run is 7/0. Division by zero gives an "undefined" result, so we say the slope is "undefined."
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The line is a vertical line: x = -10.
Answer:
x ={-3, -4, -5 , -6, -7, ...}