Yes constants stay the same. for example 4x+1. 1 is the constant because it stays the same. and like terms is basically matching. 5y+4x+2x+6y. 5y and 6y matyhch so its 11y+ 4x+2x, 11y+6x. x+ y sdoesnt match.
60 more squirrels is the answer because sine its an estimate, 91 turns into 90 therefore u have 90 squirrels and 1/3 as many chipmunks 1/3 of 90 is 30 90 - 30 = 60 Your answer is 60 more squirrels