When subtracting, change the subtraction to addition and (change, add, or subtract) the sign of the number being taken away?

Describe the 2 algebraic methods you can use to find the zeros of the function f(t)=-16t^2+400.

Due to financial difficulties the owner of 4 skateboard stores is going to close 2 of his stores. based on the money earned at each store, which two stores should remain open?

Tom travels between the two mile markers shown and then finds his average speed in miles per hour. select the three equations that represent this situation.