One morning, the temperature in a certain city was 9°c. by that evening, the temperature had dropped to -1°c. by how many degrees celsius did the temperature drop that day?

Acollege is planning to construct a rectangular parking lot on land bordered on one side by a highway. the plan is to use 680 feet of fencing to fence off the other three sides. what dimensions should the lot have if the enclosed area is to be a maximum?

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

An airplane travels at an unknown elevation before it descends 3 miles to an elevation of 15 miles. find the elevation of the plane before its descen.