Which of the following is most likely the next step in the series?

2a+7+4ahow many terms? how many variables? any like terms? yes noif yes, which ones? what are the coefficients? any constants? yes noif yes, which ones? simplify the expression by combining like terms and constants: how many terms now?

Is this a polynomial function? i need to know asap

Write a function for a rotation 90 degrees counter clockwise about the origin, point 0