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

Ted and emily played a mixed doubles tennis match against jack and brenda. in the second match. ted and brenda played against jack and emily. which type of chemical reaction does the situation demonstrate?

How could a student test the effect of removing heat from a gas that is stored in a sealed container? what must occur in order for matter to change states?

In medium-sized stars such as the sun, nuclear fusion almost always means the fusing of nuclei to form , but larger stars can produce elements as heavy as