E) Zach keeps his pet chameleon Pinky in an aquarium with dimensions shown below. There are 8 cm of sand in the bottom of the aquarium.
Zach gets a new aquarium for Pinky that is larger.
The base of the new aquarium is 25 cm by 61 cm
Zach moved the existing sand the new aquarium
How deep will the sand be in the new aquarium

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idk what the heck he answer is, i’m just putting this here so i finish my account

you are playing an adventure game on your computer. you come across a troll who won't let you pass and there is no other way to get to the other side of the river except over the bridge he is guarding.

the troll is a nerd. he takes great delight in watching people struggle with his problems. very few get them. he only gives you one chance and then he changes the puzzle. you have to solve this one.

before you are four blocks. they are numbered 11,6, -7,21.

he tells that the answer he wants is minus and between -1 and - 2. you can use +, -, ×, ÷   ( and ) as many times as you like or no times at all. you don't like the way he's looking at you, but you need to cross the bridge. what do you do?