How do you know how many solutions there are to a linear systems of equations?

The graph below could be the graph of which exponential function?

What properties allow transformation to be used as a problem solving tool

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