A survey of 200 college students yielded the following information: 98 people owned a laptop, 125 owned a smart
phone, and 72 owned both. How many people owned a smart
phone but not a laptop?

In trapezoid klmn, kj=19.2 and jm=22.5. identify ln.

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?

[10 points, algebra 2-simplifying complex fractions]according to my answer key the restrictions are -1 and 4. but why not positive 1?