if the half-life of substance A is 0.5 years, how long would it take an 2 gram sample of substance A to remain given an initial mass of 16 grams?

a. they are both space stations

happy to

pls mark as brainliest.

a: 45.9 meters

b: 4.29 seconds

step-by-step explanation:

a: h(t)=1/2(-9.8)(3)^2+0(3)+90

h(t)=-4.9(3)^2+90

h(t)=-44.1+90

h(t)=45.9 meters

b: 0=1/2(-9.8)(t^2)+0t+90

0=-4.9t^2+90

-90=-4.9t^2

18.37=t^2

t=4.29 seconds

in the second question, the numbers aren't exact, but they're a close approximation.

pie chart because it is in percents ( % )