Solve the system of equations: 10x + 7y = 99 and y - x = 2. a) (5,7) b) (5,-3) c) infinite solutions d) no solutions

Aculture started with 3000 bacteria. after 5 hours it grew to 3900 bacteria. predict how many bacteria will be present after 9 hours

It took alice 5 5/6 hours to drive to her grandparents' house for . on the way home, she ran into traffic and it took her 7 3/8 hours. how much longer did the return trip take? write your answer as a proper fraction or mixed number in simplest form. the trip home took __hours longer. ?

What is 140% of 25? because i need