John is 4 years older than his sister mary. together, their ages add up to 30. how old is mary?

The hawaiian alphabet has 12 letters. how many permutations are posible for each number of letters?

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?

Suppose g(x) = f(x + 3) + 4. which statement best compares the graph of g(x) with the graph of f(x)?