Y=-3x^2=10 is this a function?

Astuntman jumping off a 20-m-high building is modeled by the equation h=20-5t^2, where t is the same in seconds. a high-speed camera is ready to film him between 15m and 10m above the ground. for which interval of time should the camera film him?

Draw a scaled copy of the circle using a scale factor of 2

The candy store is having a 30% off sale. emma is going to buy $7.50 worth of candy.how much will she pay after the discount