Câu 3: Cho hình chóp S. ABC có đáy ABC là tam giác vuông tại B. Đường thẳng SA vuông góc mặt phẳng (ABC). a) vẽ hinh và chứng minh SA vuông góc BC b) Chứng minh BC vuông góc mặt phằng (SAB) c) Chứng minh mặt phănge (SAB) vuông góc mặt phẳng (ABC)

Driving 75 mph, it takes alicia 2 hours to reach the airport to go on a vacation. it then takes her 4 hours to get to her destination with the jet traveling at a speed of 400 mph. how many miles does alicia travel to get to her destination?

Se tiene en una caja de canicas 10, 4 blancas y 6 negras ¿cual es la probabilidad que en 2 extracciones con reemplazo sean blancas? ¿cual es la probalidad que en 2 extracciones sin reemplazo sean negras?

Luke started a weight-loss program. the first week, he lost x pounds. the second week, he lost pounds less than times the pounds he lost the first week. the third week, he lost 1 pound more than of the pounds he lost the first week. liam started a weight-loss program when luke did. the first week, he lost 1 pound less than times the pounds luke lost the first week. the second week, he lost 4 pounds less than times the pounds luke lost the first week. the third week, he lost pound more than times the pounds luke lost the first week.