A textbook store sold a combined total of 240 chemistry and history textbooks in a week. The number of chemistry textbooks sold was two times the number of history textbooks sold. How many textbooks of each type were sold?

The length of a shadow of the building is 36m. the length of the pole, which is perpendicular to the ground, is 1.9m. the length of the pole's shadow is 1.52m. what is the height of the building?

Asystem of linear equations contains two equations with the same slope. select all of the correct statements. i a. the system may have two solutions. - b. the system may have infinitely many solutions. c. the system may have one solution. o d. the system may have no solution. submit

Use the squared identities to simplify sin^2x cos^2x