If an object is projected upward with an initial velocity of 126ft per? sec, its height h after t seconds is h=? 16t^2+126t. find the height of the object after 4 seconds

In a certain city, the hourly wage of workers on temporary employment contracts is normally distributed. the mean is $15 and the standard deviation is $3. what percentage of temporary workers earn less than $12 per hour? a. 6% b. 16% c. 26% d. 36%