Paula’s Printing charges $21.50 for each T-shirt. Shantay’s Shirts has a one-time set-up fee of $63 and then charges $18 for each T-shirt. Will paulas printing always be cheaper

Yes, because if you order 10 shirts from Paula you will have to pay $215, but if you buy from Shantay, 10 shirts are $225.

No.

Step-by-step explanation:

18 is less than 21.50 & there is only a one time fee for Shantay’s Shirts.

Given sets of numbers are 

25 , 16 , 49 , 63 , 81

We can see 25 is a square of 5 because 5 * 5 = 25

Similarly 16 = 4*4 
               49 = 7*7
                81 = 9*9
But we can not write 63 as a square of any number.

SO we can say 63 is not like the others because we can write other one as a square of any number. But 63 is not a perfect square.