A microbiologist is growing bacteria cultures in the lab. After 5 minutes, a bacteria colony has 1.3 million organisms. After 12 minutes, the same colony has 41.5 million organisms. After 15 minutes, the
colony has grown to 101.3 million organisms. Is this a proportional or non-proportional relationship?
A Proportional; the constant of proportionality is 6.8 million organisms/minute
B Proportional; the constant of proportionality is 3.5 million organisms/minute
C Non-proportional; the rate of change is 19.9 million organisms/minute
D Non-proportional; there is no constant rate of change

Which statement most accurately describe why the division property of exponents does not apply to the expression (-8)^2/(-3)^4

    choose the correct definition for  extremo.  a.  end      b.  extra      c.  extract      d.  eventual 

Aspacecraft can attain a stable orbit 300 kilometers above earth if it reaches a velocity of 7.7 kilometers per second. the formula for a rocket's maximum velocity v in kilometers per second is vequalsminus0.0098tplusc ln upper r, where t is the firing time in seconds, c is the velocity of the exhaust in kilometers per second, and r is the ratio of the mass of the rocket filled with fuel to the mass of the rocket without fuel. find the velocity of a spacecraft whose booster rocket has a mass ratio of 20, an exhaust velocity of 2.1 km/s, and a firing time of 15 s. can the spacecraft achieve a stable orbit 300 km above earth?