The number of hours, t, that bacteria spread 10-fold can be modeled by the equation b(t) = b0(10)5t. there are 25 bacteria present initially and a biologist wishes to find out how many hours will elapse until there are 4,000 bacteria present. what is the exact value for the number of hours elapsed, t, in the equation 4,000 = 25(10)5t?

Given the system of equations presented here: 2x + 4y = 14 4x + y = 20 which of the following actions creates an equivalent system such that, when combined with the other equation, one of the variables is eliminated? multiply the second equation by â’4 to get â’16x â’ 4y = â’80 multiply the second equation by â’1 to get â’4x â’ y = â’20 multiply the first equation by 2 to get 4x + 8y = 28 multiply the first equation by â’1 to get â’2x â’ 4y = â’14