The radioisotope phosphorus-32 is used in leukemia therapy. the half-life of this isotope os 14.26 days. which equation determines the percent of an initial amount of the isotope remaining after t days? a= 14.26 (1/2)^100/t a= 14.26(1/2)^t/100 a= 100(1/2)^14.26/t a= 100(1/2)^t/14.26

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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?

Vertical angles must check all that apply