Answer the following question in 3-4 complete sentences. Answer the following questions about pencil drawing: - When were pencils first used? - What is graphite? - What is an HB pencil? - What happens when the H

Late at night some traffic signals change patterns and become ?

17 a tourist was planning a trip by car for travelling at some constant speed for 2.5 hours. however, he found that if he increases the speed by 20 km/h he can cover the same distance in 30 minutes less time than it was planned. what was the planned speed of the tourist, in km/h?

Balanced rock sits on a thin spike of rock in a canyon what forces keep the rock balanced on its tiny pedestal