For every 4 hours that alexa babysit her younger sister, her mom pays her $50
a)how much does alexa makes per hour?

12.5

Explanation: Divide 50$ by the 4 hours and you will get 12.5 which is $12.50.

1. a)c-14 has two more protons

2. d)they have different numbers of protons, neutrons, and valence electrons; they are all gases at room temperature.

3. c) iron and nickel.