ANSWER
The vertex form is

EXPLANATION
We want to write

in the vertex form which of the form

We achieve this BG completing the square.
We proceed as follows,

We add and subtract half the coefficient of x multiplied by a factor of 3 which is

This gives us,

We still factor 3 out of the first two terms to get,

We now got a perfect square, which factors to,

The equation is now in the vertex form.
Answer:
Step-by-step explanation:
fourth option
Matrix multiplication is possible only when the number of columns of the first matrix is equal to the number of rows in the second matrix
Answer:
Step-by-step explanation:
the population is all students enrolled in the school district
Answer:
It would seem it's an isosceles triangle.
Step-by-step explanation:
An isosceles triangle has 2 equal sides (legs). It can have 3 equal sides, but that's not so in this case. I'd appreciate if someone could correct me if I'm wrong. :)
Work provided in image. Hope this helped