What related number sentence shows the commutative property addition 3+9=12

How can we find the measure of an exterior angle if we know the measurement of an interior angle

The table below shows the height of a ball  x  seconds after being kicked.  what values, rounded to the nearest whole number, complete the quadratic regression equation that models the data? f(x)  =  x2  +  x  +  0based on the regression equation and rounded to the nearest whole number, what is the estimated height after 0.25 seconds?   feet

Find the volume of the solid bounded by the plane z=0 and the paraboloid z=1-x^2 –y^2