Can you solve this:
just number 7 and 8
everyone

For number 7 because 9 is the number of small triangle and 99 is for the bigger one so you can say 9 * 11 = 99 so 10 * 11 = 110 = x 
and for number 8 because the small triangle has the same sides so the bigger one should have too so x = 100 :)))
 hope this is helpful 
have a nice day