Answer:
A. 9
Step-by-step explanation:
Triangle Inequality: the lengths of any two sides of a triangle add up to more than the third side.
B. 10 can't be the answer because the 4 cm and 6 cm sides would just meet at a point on the 10 cm sides.
C. 11 and D. 12 can't be answers because the 4 cm and 6 cm sides would not meet (kind of like windshield wipers that are too short).
The given equation is

It is given that , when x=0, f(x)=36
Substituting these values

So the missing value of a is 2 .
We need to find the direction the ball is moving, so wee have this parametric equation, namely:

The graph of this equation is given in figure below. So, we well substitute some values of t in the equation:
If t = 0x = 4 and y = 3
P0(4, 3)
if t = 1x = 3.08 and y = 5.52
P1(3.08, 5.52)
if t = 2x = 1.16 and y = 5.72
P2(1.16, 5.72)
So, as shown in the figure, the answer is
B. <span>
counterclockwise </span>
Point D (-2,-6)>>(x,-y)>> Point D’(-2,6)
Point D’ (-2,6)>> (-x,y)>> Point D’’(2,6)