The oil sands reserves of Canada are estimated at 3.5 x 10^11 tons. How long would this supply last at a rate of consumption of 9.1 x 10^8 tons per year? Round your answer to 3 significant digits.
a. 380 yrs
b. 384 yrs
C385 yrs

Solve: 3x+y=6 4x-2y=18 show all work !

Is the power produced directly proportional to the wind speed, give reasons for your answer?

At the "no mutants allowed" country farm, every sheep has 4 legs, every chicken has two legs, and all animals have only 1 head. asked to count how many sheep and chicken are in the fields, a farm boy reports back that there are 140 feet and 50 heads. how many sheep and chicken are there? there are sheep and chicken at the farm.