a 60 kg ingot of brass consists of zinc and copper. 25% of the ingot consists of zinc. how many kilograms of copper does the ingot of brass contain . please explain as quickly as possible

Three coins are flipped. what is the probability that there will be at least two tails?

Lance lived in portugal and brazil for a total of 14 months to learn portuguese. he learned an average of 130 new words per month when he lived in portugal, and an average of 150 new words per month when he lived in brazil. in total he learned 1920 new words. write a system of equations to represent the situation. use x to represent portugal, and y to represent brazil

What is not true about kl and mn? what is mn? (show )