What's the least common multiple of 15 and 75

Write the expression as a single natural logarithm. 2 in a - 4 in y

Jordan got 27 out of 90 correct on his test . what fraction of the marks did her get correct

The serenity and the mystic are sail boats. the serenity and the mystic start at the same point and travel away from each other in opposite directions. the serenity travels at 16 mph and the mystic travels at 19 mph. how far apart will they be in 3 hours?