Which rational expression is undefined when x = 0? 5x2-4/3x-3 6x2/9x-3 8x+6/-x2+1 4x-8/-2x2

In exponential growth functions, the base of the exponent must be greater than 1,how would the function change if the base of the exponent were 1? how would the fiction change if the base of the exponent were between 0and 1

Tickets to a science exposition cost $5.75 each for studentd and $7.00 for adults.how many students and adults went if the ticket charge was $42.75

Icould really use some with this question.