Hey need help with the question please

Janet drove 300 miles in 4.5 hours. write an equation to find the rate at which she was traveling

Which coefficient matrix represents a system of linear equations that has a unique solution ? options in photo*

In each of the cases that follow, the magnitude of a vector is given along with the counterclockwise angle it makes with the +x axis. use trigonometry to find the x and y components of the vector. also, sketch each vector approximately to scale to see if your calculated answers seem reasonable. (a) 50.0 n at 60.0°, (b) 75 m/ s at 5π/ 6 rad, (c) 254 lb at 325°, (d) 69 km at 1.1π rad.