Two trains leave the station at the same time, one heading east and the other west. the eastbound train travels at 110 miles per hour. the westbound train travels at 90 miles per hour. how long will it take for the two trains to be 520 miles apart?

Ametalworker has a metal alloy that is 30? % copper and another alloy that is 55? % copper. how many kilograms of each alloy should the metalworker combine to create 90 kg of a 50? % copper? alloy?

Graph the equation. select integers for x

Someone this asap for a group of students attends a basketball game. * the group buys x hot dogs at the concession stand for $2 each. * the group buys y drinks at the concession stand for $3 each. the group buys 29 items at the concession stand for a total of $70. how many hot dogs did the group buy?