Which of the following is a monomial?
a. 3x2 + 2x − 1
b. 4
c. 3x + 4
d. 2x − 1

Mp model with mathematics explain how the number of text messages dario sent and the cost form an arithmetic sequence.then write an expression to find dario's text messaging bill if he sends n text messages over 250.

Write the system of equations represented by the matrix. 0 1 2 4 -2 3 6 9 1 0 1 3

Name these type of angles shown check all that applies