State the domain and range then determine if the relation is a function

Which data set has a greater spread? why? set a: {38, 12, 23, 48, 55, 16, 18} set b: {44, 13, 24, 12, 56} has a greater spread because .

At $1.32 million, they closed last month percent above what they paid in 2007." how much did they pay in 2007?

Which of the following represents the length of a diagonal of this trapezoid?