An optical image has magnification magnitude 2.4. The object height is 19 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
An optical image has magnification magnitude 4.2. The object height is 22 mm. Find image height magnitude. Round to 3 decimal places if needed. Answer in mm.
Club A has 9 bus users and 19 walkers. Club B has 2 bus users. Given that a student is in Club A, what is the probability they use the bus? Give a simplified fraction.
How many ordered selections of 3 distinct items can be made from 6 items without repetition?