Petrolyn motor oil is a combination of natural oil and synthetic oil. it contains 5 liters of natural oil for every 7 liters of synthetic oil. in order to make 672 liters of petrolyn oil, how many liters of natural oil is needed?

What is the measure of angle tvu shown in the diagram below

The center of the circumscribed circle lies on line segment and the longest side of the triangle is equal to the of the circle.

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?