What is the slope and y-intercept? ( i picked an answer by accident)

The parabola y = x² - 4 opens: a.) up b.) down c.) right d.) left

Describe the domain and range of y=2(3)^x-2+5

10 ! a train starts from grand city and travels toward belleville 388 miles away. at the same time, a train starts from belleville and runs at the rate of 47 miles per hour toward grand city. they pass each other 4 hours later. find the rate of the train from grand city.