How many cubic inches can you fill something up if it is 12 ft in diameter and 12 inches in height

Express in the simplest form: (x^2+9x+14/x^2-49) / (3x+6/x^2+x-56)

Aculture started with 4,000 bacteria. after 5 hours, it grew to 5,200 bacteria. predict how many bacteria will be present after 19 hours. round your answer to the nearest whole number.

Yvaries inversely as x. y =12 when x=5. find y when x=4