How do I write 684297 in expanded form

Jose predicted that he would sell 48 umbrellas. he actually sold 72 umbrellas. what are the values of a and b in the table below? round to the nearest tenth if necessary

Solve this equation using substitution. {4x + y = −2} {4x + 6y = 44}

Apackage of five erasers cost 0. $.39 at this rate how many how much would 60 erasers cost in dollars and cents