Area=pi (radius^2) Plug in numbers.
206=3.14 (r^2) Divide both sides by 3.14
65.61=r^2 Then square root both sides.
8.1ft =r Then round to the nearest foot.
r=8ft

**Answer:**

4. Demand characteristics.

**Step-by-step explanation:**

Demand characteristics refer to the situation where the subject of study change their behaviour according to what they think the experiment is about.

On the other hand experimenter bias, happens when the expertise of the experiment conducts the subject of the study indirectly. Volunteer bias, is thought to happen when there are volunteers on a study, who might have a different behaviour to the entire target group.

Step 1. TUrn the second fraction upside down (it becomes a reciprocal)

5/2 becomes 2/5

Step 2. Multiply the first fraction by the reciprocal: (Multiply tops.)

2/5 1/4 = 1x6/ 2x1= 6/3 (multiply bottom)

Step 3. Simplify the fraction (if needed.)

6/3= 2

Example: dividing by 5/2 is the same as multiplying by 2/5 so instead of dividing by a fraction. It's easier to turn that fraction upside down, then multiply.

**Answer:**

-(x^5)/3+2x^4+(23/3)x^3+8x^2+36x

**Step-by-step explanation:**

The polynomial is - 1/3(x-9)(x)(x-2i)(x+2i)(x+3)=-(x^5)/3+2x^4+(23/3)x^3+8x^2+36x

**The decrease is 8.7%**

**Step-by-step explanation:**

Old price = $23000

New price = $21000

Difference = New price - Old price

Difference = 21000 - 23000 = -2000

The negative sign indicates the decrease.

Rounding off to nearest tenth;

Percent decrease = 8.7%

**The decrease is 8.7%**

**Keywords:** difference, percentage

**Learn more about percentages at:**

#LearnwithBrainly