A house is 21/100 meters high with no roof the roof is 3/10 meters high what is the hight with roof

Students are given 3 minutes for each multiple-choice question and 5 minutes for each free-response question on a test. there are 15 questions on the test, and students are given 51 minutes to take it.how many multiple-choice questions are on the test?

Given: ac and db are diameters. m∠3=

You decide instead to take the train there. the train will take 135 minutes. convert this into hours and minutes.