please help me i still cannot understand how they get the answer i am very slow learning please show step by step show working to get the answer one by one please i am really do not know how to get tq

Given a standardized normal distribution (with a mean 0 and a standard deviation of 1), what is the probabilitythat

1. Zis between -1.57 and1.84
2. Zis less than -1.57 or greater than1.84
3. What is the value ofZif only 2.5% of all possibleZvaluesare larger?

Given a normal distribution withm= 50ands= 10, what is the probabilitythat

1. X > 43
2. X <42
3. 5% of the values are less than what Xvalue?