Which property was used to simplify the expression?

3c+9+4c=3c+4c+9

distributive property
commutative property
associative property
inverse property

If f(x)= sqrt4x+9+2, which inequality can be used to find the domain of f(x)?

The construction of copying qpr is started below. the next step is to set the width of the compass to the length of ab. how does this step ensure that a new angle will be congruent to the original angle? by using compass take the measures of angle and draw the same arc according to it.

Neal buys a board game. he pays for the board game and pays $1.54 in sales tax. the sales tax rate is 5.5%. what is the original price of the board game, before tax