The table gives the average cost, to the nearest hundred, of a 4-door sedan. a. Find a quadratic regression model for the data. Note: use x=0 for 1990. Find the coefficient of determination. Is this a good fit for the data. Why?

b. Using this regression model, estimate during which year the average cost of a new 4-door sedan reached approximately $37,000.

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.