Find the percent change from 120 to 192

Describe the possible echelon forms of the standard matrix for a linear transformation t where t: set of real numbers is onto.

Sara needs to take a taxi to get to the movies the taxi charges $4.00 for the first mile and then $2.75 for each mile after that if the total charge is $20.50 then how far was sara’s taxi ride to the movie

Which is the focus of a parabola with equation y2=4x