**Answer:**

18.8 feet, 59.1 feet to the nearest tenth

**Step-by-step explanation:**

The diameter is the line drawn that divides the circle into two while the circumference is the perimeter of the circle. Both are a measure of the radius of the circle.

The diameter D = 2r where r is the radius of the circle

The circumference = 2Πr = ΠD where Π = 22/7

Given that the circular fountain has a radius of 9.4 feet

Its diameter = 2 × 9.4 feet = 18.8 feet

The circumference = 22/7 × 18.8 feet

=59.09 feet

≈ 59.1 feet to the nearest tenth

**Answer:**

38+31+43+x=180

Step 1: Simplify both sides of the equation.

38+31+43+x=180

(x)+(38+31+43)=180(Combine Like Terms)

x+112=180

Step 2: Subtract 112 from both sides.

x+112−112=180−112

x=68

**Step-by-step explanation:**

**Answer:**

(B)Use the slope formula to prove the slopes of the diagonals are opposite reciprocals.

**Step-by-step explanation:**

Two lines are perpendicular if the product of their slope is -1. That is, the slope of one is the opposite reciprocal of the other.

Mathematically, if their slopes are

<u>Therefore, the correct option is B.</u>

**Answer: Proportional**

**Step-by-step explanation:**