Acivil engineer is preparing to build a bridge. the bridge needs to be able to hold a maximum of 20 cars. the average car weighs approximately 3,000 pounds. if the engineer builds the bridge twice as strong as necessary, how many tons should the bridge be able to hold?

Atriangular field has sides of lengths 21, 39, and 41 yd. find the largest angle. (round your answer to the nearest degree.)

The domain of a function can be represented by which one of the following options? o a. a set of output values o b. a set of f(x) values o c. a set of input values o d. a set of both input and output values

Lizette is training for a marathon. at 7: 00 she left her house and ran until 8: 30, then she walked until 11: 30. she covered a total distance of 18 miles. her running speed was six miles per hour faster than her walking speed. find her running and walking speeds in miles per hour.