Answer:
B. 4
Step-by-step explanation:
The given function is of the form:

A is called the amplitude of the given function.
We can read from the graph that, the function ranges between:
-4 and 4
This implies that:

Therefore the amplitude of the function is 4.
Hence the value of A must be 4.
Answer:
cos B = 8/17
Step-by-step explanation:
The cosine function is defined as (adjacent side) / (hypotenuse), and in this case is 8/17.
Answer:
50 kilometers
Step-by-step explanation:
If it travels 100 in an hour, it would travel 50 in half
The answer is D. 12
4, 3 and 2 are all factors of 12 (least common denominator)