Which best describes the results of Becquerel’s experiments? When placed in sunlight, the uranium did not form an image and when placed in darkness, the uranium did form an image.
When placed in sunlight, the uranium did form an image and when placed in darkness, the uranium did not form an image.
Both formed images when placed in their respective places.
Neither formed images when placed in their respective places.

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.

1.solid

2.carbon dioxide

3.helium

the answer is 75.0%.

it’s previous models   because when i picked that son of a gun’s answer it was wrong look for previous models because they might make it a different letter