Hardest math question 1+1 ? how many in total if you anwser it correct ill give u a anwser quick

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

If the discriminant if a quadratic equation is 4 which statement describes the roots?

Atruck can be rented from company a $50 a day plus $0.60 per mile. company b charges $20 a day plus $0.80 per mile to rent the same truck. find the number of miles in a day at which the rental costs for company a and company b are the same