How many half lives will have passed if 7500 atoms of carbon-14 remain? How old would the rock be? (Pls explain, I'm very confused)

If the same amount of cacl2 is added to equal volumes of water and maple syrup, which will have the higher temperature?

What stress will shift the following equilibrium system to the left? n2(g) + 3h2(g) ⇌ 2nh3(g) adding more n2(g) adding more nh3(g) increasing the pressure of the system reducing the volume of the container

Turbo the snail moves across the ground at a pace of 12 feet per day. if the garden is 48 feet away, how many days will it take for the snail to get there?