Calculate the number of side of a regular polygon whose interiors angle are each 156 degree​

The chs baseball team was on the field and the batter popped the ball up. the equation b(t)=80t-16•16+3.5 represents the height of the ball above the ground in feet as a function of time in seconds. how long will the catcher have to get in position to catch the ball before it hits the ground? round to the nearest second

Which of the following parabolas opens up?

What is the value of x? enter your answer in the box.