Joe drove at the speed of 45 miles per hour for a certain distance. he then drove at the speed of 55 miles per hour for the same distance. what is the average speed for the whole trip?

True or false when elements combine to form a mixture, the resulting chemical properties may be very different from those of the elements that make it.

Question 11 of 13 (1 point) jump to question: a stairway, ladder, or ramp must be present in excavations in which of the following situations? a. all trenches must have access/egress b. the trench is more than 15 feet wide but only 1 ½ feet deep c. the trench is more than 4 feet deep and the devices must be within 25 feet of all workers

The energy released by a nuclear fusion reaction is produced when