Sodium-24 has a half-life of 15 hours. How much sodium-24 will remain in an 18.0 g sample after 60 hours? NEED ANSWER ASAP

he forelimbs below belong to four species that descended in a direct line from the ancestral mammal shown above. of the four descendants shown, which species most likely appeared earliest in evolutionary history?

the cost of mining is extremely low compared to the money earned from mining, creating income to improve the environment.

instead of copying and pasting things off of tests or work done on computer which im sure you did, try and read over the question carefully