Water is formed when two hydrogen atoms bond to an oxygen atom. when a substance is made of two or more atoms like this, we call it a) a mixture. b) a complex. c) a compound. d) an element.

these include the fossil fuels, oil, natural gas, and coal and nuclear energy. hope this ! ^.^

-ella

the answer would be the third option, "no, ariel should have added 9^2 and 12^2 and compared that to 15^2."

this is found through the pythagorean theorem, which is a^2 + b^2 = c^2.

this is the correct way of solving the problem:

9^2 + 12^2 = 15^2

81 + 144 = 225

225 = 225