47.0 gram piece of brass is 22% tin and 78% copper what is the Mass(g) of copper in the piece

Consider the nuclear equation below. 239/94 pu—-> x+ 4/2 he. what is x?

How does the atmosphere to make earth livable? check all that apply. causes the seasons contains oxygen provides warmth creates important nutrients blocks harmful energy from the sun plz like !

Which of the following best describes technology a. something created for only scientists to use b.the method of thinking that scientists use. c.the application of engineering to create useful products. c. a scientific idea