0.139 times what number could get me to 100? PLEASE ANSWER, FAST

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.

Asquare and an equilateral triangle have the same perimeter. each side the triangle is 4 inches longer than each side of the square. what is the perimeter of the square

Xy x xy if a and b are positive integers such that a*b=9 and b*a=72 what is the value of a/b