Simplify the expression: 2b + 4 – b – 4
A: b
B: 3b
C: b+8
D: b-8

Jessica is a custodian at oracle arena.she waxes 20 m2 of the floor in 3/5 of an hour. jessica waxes the floor at a constant rate.at this rate how many sqaures meters can she wax per hour

Gregory draws a scale drawing of his room. the scale that he uses is 1 cm : 4 ft. on his drawing, the room is 3 centimeters long. which equation can be used to find the actual length of gregory's room?

Add the fractions, and simply the result to lowest terms. 2/3 + 2/7= ?