What is -9.98 as a fraction?

Barrett is comparing the membership fees for two museums. the art museum charges a one-time fee of $8.25 plus $2.25 per month. the science museum charges a one-time fee of $10.75 plus $3.50 per month. how much does barrett save by joining the art museum instead of the science museum?

The least common denominator of 4/8 and 11/18

Which is the area, rounded to the nearest tenth of square inch, of an equilateral triangle that has a perimeter of 24 inches