Mr. lindsay wrote the four expressions below on the board.

expression one:
9 + 5x minus 5 + 3x
expression 2:
10x plus 3
expression 3:
x + 12
expression 4:
4(1+2x)

which expression is equivalent to 2x + 9 - x + 3? show your answer is correct by substituting a value for x.

One expression below in undefined, and the other expression has a well defined value. which expression is undefined and explain why it has no value. which expression is defined? what is the value of that expression and how do you know? what is a different expression using a trig inverse function that is also undefined?

A. 90 degrees b. 45 degrees c. 30 degrees d. 120 degrees

Aswimming pool had 2.5 million liters of water in it. some water evaporated, and then the pool only had 22 million liters of water in it. what percent of the water evaporated?