Increasing is= [0,90], [270,360]
Decreasing is=[90,270]
Concave up=[180,360]
Concave down=[0,180]
Answer:

Step-by-step explanation:
The formula for the area of a triangle is given by :
...(1)
Where b is the length of the base and h is the height.
We need to find the value of b from the above formula.
Cross multiplying equation (1) we get :

Now dividing both sides by h. So,

So, the correct option is (D) i.e.
.
Answer:
see below
Step-by-step explanation:
AB = DC Given
AO = BO = OD = DC Def. of radii
ΔOAB ≅ ΔOCD SSS
x = 77° CPCTC
Answer: 
Step-by-step explanation:
You know that the ratio of the television's screen is
. This ratio can be also written as the following fraction:

The television shows an image with a ratio of
which can be also written as a fraction:

Set up the following proportion and solve for "x":

Now, in order to find the percent of the screen area occupied make the following division: