Which is the value of b in the equation (y^-9)^b=y^45. a)-405 b)-5 c)5 d)405

Anyone know? will mark brainliest if correct!

In a small section of a stadium there are 40 spectators watching a game between the cook islands and fiji. they all support at least one of the two teams. 25 spectators support the cook islands and 16 of these support both teams. how many support only fiji?

Fill in the table with whole numbers to make 430 in five different ways