Tai grows plants in a container called a terrarium, as shown below. He keeps the terrarium on a sunny windowsill. The terrarium is closed, so Tai cannot add water to the plants. However, the plants have enough water to grow. Which of these statements
best explains why the plants always have enough water?

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.

po-215 i got it right on the quiz

your answer is a. the enthalpy of formation for a pure element in its standard state is always positive.