The Environmental Protection Agency says on its website that "You can save up to 8 gallons of water by turning off the faucet when you brush your teeth in the morning and before bedtime." a. Estimate how much water a family of four would use each week, assuming they left the water running while brushing.
b. Estimate how much water would be saved in one day if the entire United States turned off the faucet
while brushing.
c. Put your answer to the previous question in context (compare it to the volume of water in a lake or swimming pool, for example).

idk the answer but just put a

step-by-step explanation:

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?