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

15 points ! ~ see if you know the answer to both you!

Suppose you are an avid reader and are looking to save money on the cost of books instead of paying about $20 for each book, you decide to look into purchasing a kindle for $120 you can purchase e-books for about $5 each 1. find the slope-intercept equation for the cost of the hard copy of books using x to represent the number of books 2. find the slope-intercept equation for the cost of the kindle with cost of e-books using x to represent the number of books

1. evaluate 8x(2)y9(-2) for x=-1 and y=2 2. simplify the equation. -() 3. simplify the expression. [tex]\frac{5}{x(-2) y9(5)}[/tex]