Find the proportion of observations from a standard normal distribution that falls in each of the following regions. -2.31 < z < 1.61. z equals?

Iam so stuck. what is the worked out answer for this question?

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

Find the solution(s) to the system of equations. select all that apply y=x^2-1 y=2x-2