A lighthouse keeper stands at the top of her 175ft tall lighthouse and spots a fishing
boat in the distance at sea. She estimates
the boat is about 2640ft off shore. What is
the measure of the angle of depression
from the keeper to the fishing boat?

B.a pop up at ion changes in response to a change in the environment.

Amath expression is a collection of one or more terms, which are separated by the signs ( + , - , x , / ).example :   8+b8+b  or  a−3a−3in algebra, an equation is a mathematical statement with two expressions where, each expression is separated by an equal (=) sign. variables can be present on both the sides of the equality (=) sign and we use letters to denote such variables.example 1:   x=4+2x=4+2  , [here, we can observe that the variable is present only on one side of the equation].example 2:   2x+3=x+42x+3=x+4  , [here, we can observe that the variables are present on both side of the equation].