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Question: Chlorofluorocarbons (CFCs) were used as propellants in spray cans until their build up in the atmosphere started destroying the ozone, which protects us from ultraviolet rays. Since the 1987 Montreal Protocol (an agreement to curb CFCs), the CFCs in the atmosphere above the US have been reduced from a high of 3200 parts per trillion (ppt) in 1994 to 2750 ppt in 2010.15 The reduction has been approximately linear. Let C(t) be the concentration of CFCs in ppt in year t.
(a) Find C(1994) and C(2010).
(b) Estimate C' (1994) and C' (2010).
(c) Assuming C(t) is linear, find a formula for C(t).
(d) When is C(t) expected to reach 1850 ppt, the level before CFCs were introduced?
(e) If you were told that in the future, C(t) would not be exactly linear, and that C"(t) > 0, would your answer to part (d) be too early or too late?
Create an expression for your classmates to solve that uses scientific notation and at least one of the rules for exponents you have described.
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Deer Valley receives a delivery of 1,250 lb of tomatoes from a local supplier, for which they pay 18 cents per pound. Normally, 6% of the tomatoes will be discarded because of appearance or spoilage. Find the selling price needed per pound to obta..
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What are the similarities between general environment and industry environment?
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the area of a trapezoid is 198 cm2. The height is 22 cm and the length of one of the parallel sides is 7 cm. Find the length of the second parallel side.
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The gambler decides to stop at time 4 or whenever two consecutive heads come up, if earlier. What is the expected surplus at the end of the game?
In Exercises, determine if the set of vectors S forms a subspace of the given vector space. Give reasons why S either is or is not a subspace.
At the park is a circular wading pool 20 feet in diameter. If parents are seated on the edge of the pool about every three feet, how many parents are sitting on the edge of the pool
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