Como se llama estos signos

If x+2=9 what is x?

How am i able to subtract this equation 13/18-1/21

What is the factorization of the trinominal below - x^2+2x + 48

What is equivalent to 23 degrees 20' 48"

A homeowner wants to insulate the new recreation room in her basement. She has been told that 3' of insulation would do the job. The walls are all 9' high and respectively measure 13', 13', 18', and 18' in length.

X^2-10x+21x2-10x+21

Which of the following is the solution set of 18 - 3n + 2 = n + 20 - 4n? Ø {0} all reals

The art teacher found 3 boxes of brushes and 4 extras brushes. There were 40 brushes in all. how many brushes were in each box

Xavier and Madeline's age combined is 28. Xavier is 4 yrs older than half of Madeline's age. How old will Xavier be in 2 yrs?

Rover's cylinder dog bowl has a diameter of 6 inches and a height of 2 inches. Approximately how much water does it hold? Use 3.14 for pi and round your answer to the nearest cubic inch.