Which of the following is a monomial

A. 5x^2+2x+3
B. √x-1
C. 4x
D. 3/x

What is the standard form of -5x^2+2x^4-11+x^3+3x

Awindow washer cleans 42 windows in 2 hours. at this rate, how many windows did he clean in 180 minutes.

Do one of the following, as appropriate: (a) find the critical value z subscript alpha divided by 2 , (b) find the critical value t subscript alpha divided by 2 . 99%; nequals 17; sigma is unknown; population appears to be normally distributed.