**Answer:**

**Step-by-step explanation:**

**Cosecant:**

The cosecant is one divided by the sine. Thus:

**Tangent **is sine divided by cosine, so we first find the sine, then the cosine, to find the tangent.

**Sine and cosine:**

First quadrant, so the cosine is positive. Then

**Tangent:**

Sine divided by cosine. So

The answer is:

If -3 + i is a **root **of the **polynomial function **f(x), -3 - i must also be a **root** of f(x)

<h3>How to determine the true statement?</h3>

The **root **of the **polynomial function **is given as:

-3 + i

The above root is a **complex root.**

If a polynomial has a **complex root**, then the **conjugate **of the root is also a root of the function

The conjugate of -3 + i is -3 - i

Hence, if -3 + i is a **root **of the **polynomial function **f(x), -3 - i must also be a **root** of f(x)

Read more about **polynomial functions** at:

brainly.com/question/20896994

**Answer**

**-4.25**

**Step-by-step explanation:**

I used this site: https://www.symbolab.com/solver/algebra-calculator

Have a great day !

**Answer:**

-18

**Step-by-step explanation:**

because 6 by -3 6(-3) meaning to mulitple so you mulitple 6x -3

C.

The 520 is the new thing added to the equation, which makes it equal to the new weight room's size.