Which tiles should be added to the model below to make zero? O
O 6 negative tiles
6 positive tiles
O 3 negative tiles and 3 positive tiles
6 negative tiles and 6 positive tiles

b is 38 degrees.

a is 52 degrees.

this is because if b is 38 and a is 14 degrees more than b than 38+14=52 and 52+38=90 degrees. hope this .

answer: 12   they all have at least 28 days

step-by-step explanation: haha