PLEASE HELP 100 points

Answer and Step-by-step explanation:
Left: 1 ten + 8 ones = 18
Right: 2 tens + 9 ones = 29
You get this answer by adding all of the cubes together. You could also see that the long blocks count up to ten so you could subtract how much you added by ten to get the ones.
Hope this helped you out! Have a wonderful day!