All words with a repeated letter are allowed. Green glass door, apple and ball.

Three cuts. Cut each link in one chain. Separate them, and use the links to join the ends of the three intact chains.

The amount of change was $36.41, which meant Ethel handed Merle one of everything in her drawer:

$20 bill
$10 bill
$5 bill
$1 bill
A quarter
A dime
A nickel
A cent
———
$36.41

Good ol’ Ethel.

K. It’s the series of capital letters without curves in alphabetical order.

(7 x 7 x 7) + (9 x 9 x 8) + ((9 – 8) x 8) = 999
(77 + 7) + 888 + (9 + 9 + 9) = 999

If other operators were allowed, another solution would be 999 modulo (888 x 777). I’m sure there are more solutions.

She didn’t turn the water on, she wore a shower cap or it was a baby shower.

The half bucket of dimes. It might be tempting to say they’d be worth the same, since a nickel is worth half as much as a dime. This would be accurate if they were the same size, but the dime is smaller. Thus more dimes would fit in the same space, resulting in more value for you, you lucky dog.