If 50 ducks went to a pond but 13 left how many remain at the pond?

If you could answer these your a life saver

What is the axis of symmetry of the function f(x)=-(x+ 9)(x-21)

The graph below shows the line of best fit for data collected on the number of cell phones and cell phone cases sold at a local electronics store on twelve different days. number of cell phone cases sold 50 * 0 5 10 15 20 25 30 35 40 45 number of cell phones sold which of the following is the equation for the line of best fit? a. y = 0.8x b. y = 0.2x c. y=0.5x d. y = 0.25x