A type of bacterium triples in population every hour. Assuming you start with 120 bacteria, the formula that models the number of bacteria at the beginning of hour n is: a(n) = 120 • 3n – 1 How many bacteria will there be at the beginning of hour 5?

The u-drive rent-a-truck company plans to spend $13 million on 320 new vehicles. each commercial van will cost $25 comma 000, each small truck $50 comma 000, and each large truck  $80 comma 000. past experience shows that they need twice as many vans as small trucks. how many of each type of vehicle can they buy?

What are the solutions of the system? y = x^2 + 2x +3y = 4x - 2a. (-1, -6) and (-3, -14)b. (-1, 10) and (3, -6)c. no solutiond. (-1, -6) and (3, 10)

Can someone me with #s 8, 9, and 11. with just one of the three also works. prove using only trig identities.