What is the solution to the following equation? x+(-21)=8

Ben bowled 124 and 188 in his first two games. what must he bowl in his third game to have an average of at least 160?

2.5 milligrams is equivalent to how many grams

Answer asap and if you do you will get brainliest. catherine buys a gallon of ice cream from the store. after taking it home, she eats a fifth of a gallon of ice cream. her sister eats some of the ice cream as well. if two-thirds of the original amount of ice cream is left, then what fraction of a gallon of ice cream did her sister eat?