Answer:
(a). 
= ![\left[\begin{array}{cc}12&-4\\66&6\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D12%26-4%5C%5C66%266%5Cend%7Barray%7D%5Cright%5D)
Step-by-step explanation:
A = ![\left[\begin{array}{cc}5&-4\\3&6\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D5%26-4%5C%5C3%266%5Cend%7Barray%7D%5Cright%5D)
=
= ![\left[\begin{array}{cc}5&12\\3&66\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bcc%7D5%2612%5C%5C3%2666%5Cend%7Barray%7D%5Cright%5D)
Your sales tax is $1.35.
Your tip is $3.00.
Your total is going to be $19.35
I think you forgot to put a picture..........
The area of a triangle is base * height / 2
The length of the base is 16 - 12 = 4
The height is 31 - 0 =0
Then the area is 4*31/2 = 62
Parallel: the lines have = slopes. We thus need 5/6 to equal 2/p. then 5p must equal 12, and p = 12/5. (answer)
Check: Is 5/6 = 2 / (12/5)? YES
Perp.: The lines have slopes that are negative reciprocals of one another.
Then -6/5 = 2/p, or
-6 2
---- = ----
5 p Thus, -6p = 10, and p = -5/3 (answer)
