Answer:

Step-by-step explanation:
Let
x-----> the angle of depression
we know that
The sine of angle x is equal to divide the altitude (opposite side to angle x) by the distance from the runway (hypotenuse)


Answer:
The answer to your question is the letter A) 5 (6x + 4y)
Step-by-step explanation:
Data
(6x + 4y)(5)
There are two Commutative properties, one for addition and one for multiplication. In this problem we need to work with the Commutative property of multiplication.
This property tells us that is does not matter the order in which we multiply the numbers the result will be the same.
Then,
(6x + 4y)(5) = (5)(6x + 4y)
After 1988 the distance got smaller and smaller.