Write the following as an algebraic expression. Then simplify. The perimeter of a triangle whose sides are of lengths 5x, 5x + 9, and x.
A. 19x
O B. 25x^2 +45x
O C. 10x + 9
O D. 11x +9

Pls answer asap! giving ! replace [description 1] with a description of the first set of data you found during your research. replace [data values 1] with a list of the values in the first data set. replace [description 2] with a description of the second set of data you found during your research. replace [data values 2] with a list of the values in the second data set.