name a pair of fractions that use the least common denominator and are equivalent to 9/10 + 5/6

The smallest common denominator is 30 in so  9/10=27/30 and 5/6=25/30 are your answers ; ]

the denominators 6 and 10 both have 30 in common. So lets get the common denominator. it is 9/10=27/30  and 5/6=25/30.  It should be 27/30+25/30 which is 52/30 which can be simplified down to 26/15. This is your final answer