01.13.4
S
Brass is made from a mixture of copper and other elements. A mixture that is 80% copper is combined with a mixture that is
60% copper, resulting in 100 pounds of brass that is 65% copper.
Which equation can be used to find x, the amount of 60% mixture used to create the 65% mixture?

How do i do this activity, is appreciated

Tiffany drives 285,120 feet before lunch and 628,320 feet after lunch. about how many kilometers does she drive all together

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