2. the height of a ball in feet is modeled by
f(x) = -16x2 + 80x, which is shown below,
where x is the time in seconds after it is hit.
02 4 6 8 10
a. how long is the ball in the air?
b. find and interpret the vertex of the graph.

Where m is the slope of the line and b is the y-intercept of the line, or the y-coordinate of the point at which the line crosses the y-axis. to write an equation in slope-intercept form, given a graph of that equation, pick two points on the line and use them to find the slope. this is the value of m in the equation.

I’m not sure i’m sorry