How can you subtract fractions with unlike denominators?

question: 1/5 - 9/10 =

please help

A25-inch wide drum is used in a marching band. what area does the top of the drum cover? round to the nearest hundredth. (use 3.14 for pi.)

The image of the point (-6, -2)under a translation is (−7,0). find the coordinates of the image of the point (7,0) under the same translation.

Factor the monomial completely 42a3b3