What does a particular point on a line of a phase diagram represent?

The lines on the phase diagram represent combinations of pressures and temperatures at which two phases coexist in equilibrium. The green line dividing the solid and liquid phases represents melting solid to liquid and freezing liquid to solid

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By: BananaPeelBugaboo

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.

the answer is a for sure mark brainliest i had got this right on usatestprep