Can someone help me with this

Two variables, x and y, vary inversely, and x=12 when y=4. what is the value of y when x=3?

What is the absolute value of -100000000000000?

The price of a lawn mower is x dollars. the store is having a 75% end of summer clearance sale. which expression can be used to find the clearance price of the mower? a) .25x b) .75x c) x - .25(75) d) x + .25(75)