**Answer:**

4x-20 is the same as x+x+x+x-20

**Answer:**

3

**Step-by-step explanation:**

We can say that a zero or root, is a point that intercepts the x-line. In this case there are 3 points that intercepts the x-line.

(-2.8,0); (1,0); and (7,0)

**Answer:**

(3V)/A = h

**Step-by-step explanation:**

V = 1/3 Ah

Solve the literal equation using inverse operations;

V = 1/3 Ah

*3 *3

3V = Ah

/A /A

(3V)/A = h

**Answer:**

Answer is below

**Step-by-step explanation:**

Subtract 2x from both sides.

Subtract 15 from both sides.

Divide both sides by -1.

So therefore your answer is 15