Calculate the radiocarbon age of a sample whose 14C activity is half of a modern standard. Please help!!

Asample contains 16.75 g of the radioisotope u-236 and 50.25 g of its daughter isotope, th-232. how long did it take for decay to take place if one half-life of u-236 is 23 million years? 46 million years 69 million years 92 million years 115 million years

If i can still dissolve more sugar into the solution at a certain temperature what would i call that solution

What mass of natural gas (ch4) must you burn to emit 276 kj of heat?