Which is true about rational numbers? a every rational number has a decimal representation that terminates. b every rational number has a decimal representation that either repeats or terminates. c every rational number has a decimal representation that repeats. d no rational number has a decimal representation, because rational numbers are written as fractions.

B Every rational number has a decimal representation that either repeats or terminates.

Step-by-step explanation:

A rational number is a number that can be written as a fraction of integers. As a decimal, a rational number either terminates or repeats.

B Every rational number has a decimal representation that either repeats or terminates.

he used the algebra tiles correctly.

step-by-step explanation:

given : 3x(2x-1)

solution :

since he used algebra tiles .

armando's solution is the same in the solution shown in figure

as he distributed 2x into x and x and wrote them vertically

and also write   -1 vertically

and 3x into x and x and x and wrote it horizontally

performing the multiplication in the algebra tiles we get

and solving the given expression :

3x(2x-1)

since solving the expression using tiles   and solving the expression algebraically we get the same answer

thus   we can choose the first statement as the answer to this problem which is "he used the algebra tiles correctly".