A paper airplane was thrown from the top of a tall building. The height of the paper airplane above the ground can be found using the function   y  =  −1.5x + 60 
where x is the time in seconds the airplane has been in the air.

 How many seconds did it take the paper airplane to reach the ground?

Solve the given system of equations. 2y= -x+9 , 3x-6= -15

The vertex of this parabola is at (-2,-3). when the x-value is -1, the y-value is -5. what is the coefficient of the squared expression in the parabola's equation?

1. writing an equation for an exponential function by 2. a piece of paper that is 0.6 millimeter thick is folded. write an equation for the thickness t of the paper in millimeters as a function of the number n of folds. the equation is t(n)= 3. enter an equation for the function that includes the points. (-2, 2/5) and (-1,2)