which statement is true about the four atoms shown in figures a, b, c, and d?
a. a and c are different elements, while d is an isotope of c.
b. b and d are different elements, while a is an isotope of d.
c. a and b are different elements, while c is an isotope of b.
d. c and d are different elements, while b is an isotope of c.

I think that the answer is A.

? you expect us to answer this? ? this is your schoolwork, i don't think we can with this, i think it would considering being

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.