What is the measure of the missing angle? 111

What are the measures of ∠a, ∠b, ∠c and ∠d? explain how to find each of the angle measure.

The functions f(x) and g(x) are shown in the graph f(x)=x^2 what is g(x) ?

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?