15. the velocity of an object fired directly upward is given by v = 20 – 9.8t, where t is time in seconds. write an inequality which could be used to describe when the velocity will be between 10 and 20 meters per second. (see ex. 8) explain to verify your choice. 10 > 20 – 9.8t > 20 10 > 20 – 9.8t or 20 – 9.8t < 20 10 < 20 – 9.8t or 20 – 9.8t < 20 10 < 20 – 9.8t < 20