What is the pressure of 0.5 moles of oxygen gas in a 1.50L container at -37°C?

What number produces an irrational number when multiplied by -1.25

Suppose a pendulum is l meters long. the time,t,in seconds that it tales to swing back and forth once is given by t=2.01

After t seconds, a ball tossed in the air from the ground level reaches a height of h feet given by the equation h = 144t-16t^2. after how many seconds will the ball hit the ground before rebounding?