Mary has four children of different integers under 10. The product of their ages is 2016. What is the sum of their ages?

I’m not sure what your trying to say here.. can you clarify again?

The density of water is 1 g/cm cubed and in order for the pebble to sink its density has to be greater than the density of water and in order for the twig to float its density has to be less than the density of water

Idon’t really understand the question i’m sorry i can’t

Each calcium ion has a charge of +2, which can also be written as ca2+. if those ions move out of the neuron and no other ions are moving, the neuron would lose the positive charge associated with those ions and become more negatively charged.