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 laptop but not a smart phone?

Aiden drives to school and back each day. the school is 16 miles from his home. he averages 40 miles per hour on his way to school. if his trip takes 1 hour, at approximately what speed does aiden drive home?

Me! 50 points! why does when we come home, our door is unlocked and there is grease on the door knob, me solve this , and i don't know what category this goes under

If cos(2x) = tan^2(y), show that cos(2y) = tan^2(x).