A piece of copper has a mass of 680 kg. How many atoms does the sample contain?

There a total of 82 students in the robotics club and the science club. the science club has 6 fewer students than the robotic club. how many students are in science club?

Choose the point slope form of the equation below that represents the like that passes through the points (-6,4) and (2, 0)

Rob spent 25%, percent more time on his research project than he had planned. he spent an extra h hours on the project. which of the following expressions could represent the number of hours rob actually spent on the project? two answers