How do you know if a graph, table, or mapping diagram is a function?

This graph shows which inequality? a ≤ –3 a > –3 a ≥ –3 a < –3

Which shows a reasonable estimation for 124% of 42 using the distributive property?

The value, v, of kalani’s stock investments over a time period, x, can be determined using the equation v=750(0.80)^-x. what is the rate of increase or decrease associated with this account? 20% decrease 20% increase 25% decrease 25% increase