Answer:
D
Step-by-step explanation:
If there is a 2x2 matrix as ![\left[\begin{array}{ccc}a&b\\c&d\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Da%26b%5C%5Cc%26d%5C%5C%5Cend%7Barray%7D%5Cright%5D)
The determinant is given by ![\frac{1}{ad-bc}\left[\begin{array}{ccc}d&-b\\-c&a\\\end{array}\right]](https://tex.z-dn.net/?f=%5Cfrac%7B1%7D%7Bad-bc%7D%5Cleft%5B%5Cbegin%7Barray%7D%7Bccc%7Dd%26-b%5C%5C-c%26a%5C%5C%5Cend%7Barray%7D%5Cright%5D)
<em>Now, if we calculate the value of "ad - bc", we see that:</em>

We can't calculate the inverse, the inverse doesn't exist. The answer is D.
Answer:
<h2>A = 2.25π</h2>
Step-by-step explanation:
The formula of an area of a circle:

r - radius
The formula of a circumference of a circle:

We have:

Substitute:
<em>divide both sides by 2π</em>

Substitute:

Answer:
That would mean for every 30 campers there are 2 counselors and 45:3,60:4 and so on
Step-by-step explanation:
The equation would be 6x+x=63. Not sure how the models play out, but good luck
Yes, felt that. thanks and have a lovely day!:D