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Unformatted text preview: xy8 z = y + 4 z = 8 3 y + 14 z = 22 8. (8 pts) Solve x x21 = 3 x + 1 . 9. (5 pts) Solve ( x + 1) 2 = 2. 10. (8 pts) If the supply and demand functions for a commodity are given by pq = 2 and ( p1) q = 20, respectively, ﬁnd the market equilibrium. 11. (12 pts) If total costs are C ( x ) = 2000 + 40 x + x 2 and if total revenues are R ( x ) = 130 x , ﬁnd: (a) The breakeven points. (b) The output that maximizes proﬁt. 12. (8 pts) The monthly charge for propane in a small town is given by f ( x ) = ( 38 if 0 ≤ x ≤ 20 38 + 0 . 4( x20) if x > 20 where x is usage in hundreds of gallons and f ( x ) is in dollars. Find the monthly charge for the following usages: (a) 30 gallons (b) 3000 gallons (c) 4000 gallons (d) Graph the function x 10 20 30 40 y 10 20 30 40 50 Bonus 5 pts: Simplify the following ± 3 m 1 / 6 n 1 / 3 4 n2 / 3 ² 2 using only positive exponents....
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This note was uploaded on 10/20/2010 for the course MATH 201 taught by Professor Smith during the Fall '08 term at Washington State University .
 Fall '08
 SMITH
 Math

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