Answer:
I just do a' as a sample. You calculate b' and c'
Step-by-step explanation:

Now, calculate b x c
![\left[\begin{array}{ccc}i&j&k\\2&3&1\\1&-1&-2\end{array}\right] =](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Di%26j%26k%5C%5C2%263%261%5C%5C1%26-1%26-2%5Cend%7Barray%7D%5Cright%5D%20%3D%3C-5%2C%205%2C-5%3E)

A parallelogram has 4 sides. there are different Parallelograms to know but what you asked was a Square. A square is a parallelogram that has all angles at 90° and Congruent to each other
Answer:
35
Step-by-step explanation:
- Negative × negative = Positive
- -7 × -5 = 35
I hope this helps!
It should be y = 252 sorry if its wrong !